The Comprehensive Guide to Retinal and Vitreous Diseases: Symptoms, Diagnosis, Treatment, and Modern Surgeries

A comprehensive reference from Dr. Mahmoud Hassaan and Al-Mashreq Eye Center covering everything about retinal and vitreous diseases: symptoms, diagnosis, the latest treatments, and surgeries.

The Comprehensive Guide to Retinal and Vitreous Diseases: Symptoms, Diagnosis, Treatment, and Modern Surgeries

The retina is an extremely delicate and complex neural tissue. It acts as the sensitive film in the eye's camera, responsible for receiving light and converting it into electrical signals that the optic nerve sends to the brain to form the image we see. Any disruption to this vital part, no matter how minor it may seem initially, can rapidly progress to become a real threat to vision. Retinal and vitreous diseases, such as diabetic retinopathy, retinal detachment, and macular holes, are among the most serious eye conditions and are often the cause of permanent vision loss if diagnosis and treatment are delayed. Many of these diseases begin with mild symptoms that patients might overlook, such as seeing "floaters" or transient light flashes, but these can actually be the first warning signs of an impending problem.

This comprehensive reference page, presented by Dr. Mahmoud Hassaan, Consultant Vitreoretinal Surgeon at Al-Mashreq Eye Center, is your guide to understanding this intricate world within the eye. We will detail the anatomy of the retina, the most common symptoms to watch out for, emergency situations that require immediate attention, as well as a thorough explanation of key diseases like diabetic retinopathy and retinal detachment. We will also cover the latest diagnostic methods and available treatments, from intravitreal injections and laser therapy to advanced microscopic surgeries. Use the table of contents below for quick navigation through the different sections of the guide.

What are the Retina and Vitreous Body? Understanding the Basics of Vision

To understand retinal diseases, we must first familiarize ourselves with the intricate internal anatomy of the eye. Imagine the eye as a dark room whose purpose is to capture a clear image of the outside world. At the front of this room are the "lenses" (cornea and crystalline lens) that gather and focus light, and at the back of the room is the "screen" that receives this image, which is the retina.

What is the Retina?

The retina is a very thin layer of light-sensitive neural tissue lining the inner back wall of the eye. Its thickness is less than half a millimeter, yet it contains ten stacked layers of specialized cells, most importantly two types of photoreceptor cells:

• Rods: Responsible for vision in dim light and night vision, concentrated in the peripheral parts of the retina.
• Cones: Responsible for color vision and fine details in bright light, densely concentrated in the center of the retina in an area called the "macula" or fovea. The macula is the most important part of the retina, as it gives us the ability to read, recognize faces, and drive.

When light strikes these cells, complex chemical reactions convert light energy into neural impulses. These impulses travel through a network of other nerve cells within the retina to finally reach the optic nerve, which in turn transmits them to the visual cortex in the brain, where they are translated into the images we perceive. The retina is nourished by a delicate network of blood vessels that supply it with the oxygen and nutrients necessary for its function, and any defect in these vessels, as occurs in diabetes, directly affects retinal function.

What is the Vitreous Body?

The vitreous body is a transparent gel-like substance that fills the largest cavity in the eye, located between the crystalline lens in the front and the retina in the back. The vitreous body is composed of 99% water, with the remainder being a network of collagen fibers and hyaluronic acid, giving it its raw egg white-like consistency.

Its primary function is to maintain the spherical shape of the eye and provide gentle support for the retina, pressing lightly on it to keep it attached to the posterior wall of the eye. With age, this gel begins to change, becoming more fluid and its collagen fibers shrink, leading to the phenomenon of posterior vitreous detachment, which is usually a natural process, but in some cases, it can cause traction on the retina and lead to a tear.

In summary, the retina is the active neural tissue that "sees," while the vitreous body is the supportive structure that fills the eye and maintains its internal environment. Most diseases and surgeries in this specialized field relate to the interaction between these two parts.

Understanding this relationship helps to grasp why a simple complaint such as seeing "cobwebs" (resulting from changes in the vitreous body) can be a warning sign of a serious retinal problem. Therefore, a comprehensive eye examination and fundus inspection are essential to assess the health of these two vital components.

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Most Common Symptoms of Retinal Diseases: Signs Not to Be Ignored

Retinal diseases can be silent in their early stages, but when symptoms appear, they are often an indication of a problem that requires specialized medical evaluation. Ignoring these symptoms can lead to permanent damage that is difficult to treat. Below is a list of the most common symptoms that may indicate a retinal or vitreous disease:

• Eye Floaters: These are points, spots, or cobweb-like black or gray threads that float in the field of vision, being more noticeable when looking at a light-colored surface such as the sky or a white wall. They occur due to the condensation of collagen fibers in the vitreous body. In most cases, they are normal, but their sudden appearance in large numbers may be a sign of a retinal tear or vitreous hemorrhage.
• Flashes of Light: This is seeing lightning-like flashes of light, especially in the peripheral field of vision. This symptom occurs due to vitreous traction on the retina. The appearance of flashes of light and a dark curtain vision together is a very serious sign.
• Appearance of a black curtain or shadow obscuring part of the vision: The patient feels as if a gray or black curtain has started to cover part of the visual field (from above, below, or sides). This symptom is the classic sign of retinal detachment, an emergency that requires immediate surgical intervention.
• Sudden or gradual blurring or haziness of vision: The patient may feel that vision has become unclear or hazy, as if looking through dirty glass. The cause may be fluid accumulation in the macula (macular edema) as in diabetic macular edema, or the beginning of a macular hole.
• Distorted vision or wavy straight lines (Metamorphopsia): The patient notices that straight lines, such as door and window frames or lines of text, appear wavy or curved. Sudden distorted vision is a distinctive sign of macular diseases such as wet age-related macular degeneration or epiretinal membrane.
• Appearance of a blind or dark spot in the center of vision (Central Scotoma): The patient complains of a fixed spot in the center of the visual field that hinders reading or recognizing faces. This symptom is directly associated with macular diseases such as macular hole or advanced macular degeneration.
• Change in color vision: Colors may appear faded or different between the two eyes. This symptom may indicate an affection of the cone cells in the macula or optic nerve damage.
• Difficulty seeing in dim light or night blindness: The patient finds it very difficult to adapt to darkness or see at night. This complaint is the main characteristic of some hereditary retinal diseases such as retinitis pigmentosa and night blindness.
• Sudden and severe vision loss: The patient may suddenly and completely lose vision in one eye, as if "the light has gone out." This condition may be caused by central retinal artery occlusion (CRAO), which is an "eye stroke" and requires emergency intervention within a few hours.

When is a Condition an Emergency? Danger Signs Requiring Immediate Emergency Care

In ophthalmology, particularly in retinal specialty, timing is the crucial difference between preserving vision and losing it permanently. Some symptoms cannot wait for a routine appointment but require immediate attention at a specialized eye doctor or an emergency department equipped to handle retinal conditions, such as Al-Mashreq Eye Center supervised by Dr. Mahmoud Hassaan.

List of Emergency Symptoms for Retinal Diseases:

• Sudden appearance of a black curtain or shadow covering the visual field: This is the most indicative symptom of retinal detachment. The wider this curtain, the larger the detached part of the retina, and if it reaches the macula, the chances of full vision recovery diminish significantly.
• Sudden and dense increase in "floaters" accompanied by light flashes: This combination of symptoms strongly suggests a retinal tear. A tear is the stage preceding complete detachment, and treating it with laser at this stage may prevent the need for major and complex surgery later.
• Sudden and complete vision loss in one eye: Whether accompanied by pain or not, this symptom may be a sign of central retinal artery occlusion (eye stroke), a condition that requires treatment within only 4-6 hours to attempt to save any retinal function.
• Severe eye pain with redness and severe blurring of vision after surgery or injection in the eye: These symptoms may be a sign of acute endophthalmitis, a severe bacterial infection that can destroy the eye within 24-48 hours if not treated urgently.
• Direct injury or severe blunt trauma to the eye followed by any of the above symptoms: Accidents and trauma are common causes of retinal detachment, and the fundus must be carefully examined after any severe eye injury to ensure there are no tears or bleeding.

Dealing with these acute retinal detachment emergency signs and other emergencies requires surgical expertise, a comprehensive medical team, and advanced diagnostic and therapeutic equipment. Rapid response from the patient and going to the right place is the first and essential step in the journey to save vision.

Diabetic Retinopathy

Diabetic retinopathy is one of the most serious complications of diabetes on the eye, and it is the leading cause of blindness among working-age adults. This disease arises from the long-term effects of high blood sugar levels, which lead to damage to the tiny blood vessels that supply the retina, the light-sensitive neural layer at the back of the eye.

Over time, these damaged vessels can leak fluids and fats, or they may become completely blocked, preventing sufficient blood from reaching parts of the retina. In advanced stages, the retina attempts to compensate for this lack by forming abnormal and fragile new blood vessels, leading to severe complications such as vitreous hemorrhage and retinal detachment.

Stages of Diabetic Retinopathy

The progression of the disease is divided into two main stages:

1. Non-Proliferative Diabetic Retinopathy (NPDR): This is the early stage of the disease. In this stage, the walls of the retinal blood vessels weaken and bulge to form what are called "microaneurysms", which can cause fluid or blood to leak into the retina. The patient may not experience any symptoms at this stage, but a specialized doctor can detect these changes during a fundus examination.
2. Proliferative Diabetic Retinopathy (PDR): This is the advanced and more serious stage. When many blood vessels are blocked, the retina begins to send signals for the growth of new blood vessels (Neovascularization) to compensate for the ischemia. These new vessels are fragile and abnormal, growing on the surface of the retina and vitreous. They can bleed easily causing vitreous hemorrhage, or they can contract and pull the retina with them causing tractional retinal detachment, both of which lead to severe vision loss.

Diabetic Macular Edema

Diabetic Macular Edema (DME) is a common complication that can occur at any stage of diabetic retinopathy, but it is more common as the disease progresses. Edema occurs when fluids leak from damaged blood vessels and accumulate in the "macula" or fovea, which is the part responsible for sharp central vision and fine details such as reading and facial recognition. This swelling leads to blurred and distorted central vision, and if left untreated, it can cause permanent damage.

Accurate Diagnosis: Your Window to Successful Treatment

Early diagnosis is the cornerstone of preserving vision. At Al-Mashreq Eye Center, Dr. Mahmoud Hassaan relies on the latest diagnostic technologies to accurately assess the retinal condition:

• Dilated fundus examination: Allows the doctor to clearly see the retina, blood vessels, and optic nerve.
• Optical Coherence Tomography (OCT): A non-invasive test that uses light waves to create high-resolution cross-sectional images of the retina. OCT is essential in diagnosing and monitoring retinal edema, accurately measuring macular thickness and determining the amount of accumulated fluid.
• Fluorescein Angiography (FFA): Involves injecting fluorescein dye into an arm vein and imaging the retina as the dye flows through its blood vessels. This test reveals leakage areas, vessel blockages, and abnormal blood vessel growth.

Modern Treatment Options

Treatment options depend on the stage and severity of the disease. Dr. Mahmoud Hassaan develops a personalized treatment plan for each patient, which may include:

• Intravitreal injections (Anti-VEGF): These injections have revolutionized the treatment of diabetic macular edema and proliferative diabetic retinopathy. These drugs (such as Eylea, Lucentis, and Vabysmo) inhibit vascular endothelial growth factor (VEGF), which reduces leakage and prevents the growth of abnormal blood vessels.
• Laser treatment (retinal photocoagulation): Argon laser is used to seal blood vessels that leak fluid (in localized edema) or to cauterize large areas of the peripheral retina (PRP) in cases of proliferative retinopathy. This procedure reduces the retina's need for oxygen, thereby inhibiting signals for new blood vessel growth.
• Vitrectomy surgery: This is resorted to in advanced cases, such as the presence of severe vitreous hemorrhage that does not clear, or when proliferative diabetic retinopathy is accompanied by tractional retinal detachment.

Prevention remains the first and most important line of defense. Strict control of blood sugar, blood pressure, and cholesterol levels, in addition to regular examinations, are key to protecting your vision from this silent disease.

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Retinal Detachment

Retinal detachment is an ophthalmological emergency that occurs when the neural layer of the retina separates from the underlying retinal pigment epithelium (RPE), which supplies it with oxygen and nutrients. When detachment occurs, the retinal cells stop working, leading to vision loss. If this condition is not treated promptly, it can result in permanent loss of sight in the affected eye.

Types of Retinal Detachment

There are three main types of retinal detachment:

1. Rhegmatogenous Retinal Detachment: This is the most common type. It occurs as a result of a tear or hole in the retina, allowing vitreous fluid to leak underneath and separate it from the eye wall. This type often occurs due to age-related changes in the vitreous, in patients with high myopia, or after eye injuries.
2. Tractional Retinal Detachment: Occurs when fibrous tissue forms on the surface of the retina and contracts, pulling the retina and detaching it. This type is common in patients with advanced diabetic retinopathy or after severe eye injuries.
3. Exudative Retinal Detachment: This type results from fluid accumulation under the retina due to other eye diseases such as tumors, severe inflammation, or vascular diseases, without a tear or traction.

Diagnosis and Treatment: A Race Against Time

Diagnosis relies on fundus examination after dilating the pupil. The doctor may also use ocular ultrasound (B-Scan) if there is opacity (such as hemorrhage or dense cataracts) that prevents clear visualization of the retina.

The goal of treatment is to reattach the retina and close any tears or holes. The surgical approach is chosen by an experienced surgeon like Dr. Mahmoud Hassaan based on the type, location, and size of the detachment:

• Retinal Laser Photocoagulation or Cryopexy: If a retinal tear is detected before complete detachment occurs, it can be encircled with laser or cryopexy to create a scar that prevents fluid leakage and progression to detachment.
• Scleral Buckle Surgery: This surgery involves placing a silicone band around the outside of the eye (sclera), which indents the eye wall to bring the choroid closer to the detached retina and close the tear.
• Vitrectomy Surgery: This is the most common surgery now, especially for complex cases. The surgeon removes the vitreous that is causing traction on the retina, then treats the tears with an internal laser, and finally fills the eye with a gas bubble or silicone oil to push the retina back into place until it heals.

Post-Surgery: Your Role in Treatment Success

The post-surgical period is crucial for the success of the operation. If a gas bubble is used, the doctor will ask you to maintain a specific head position (often face-down) for several days or weeks. This ensures that the bubble presses on the correct area of the retina to help it reattach. Adhering to the head position after retinal surgery with gas is essential for surgical success.

The success rates of retinal detachment surgery exceed 90% in anatomically reattaching the retina. However, the extent of vision recovery depends on whether the macula was detached before surgery and the duration of the detachment. The faster the surgical intervention, the better the chances of vision recovery. For this reason, retinal detachment is an emergency that requires high surgical expertise and rapid intervention, which is provided at Al-Mashreq Eye Center.

For reservations and inquiries: 01002310813

Macular Hole and Epiretinal Membrane (ERM)

The macula, or fovea, is a small yet vital part in the center of the retina, responsible for sharp central vision used for reading, driving, and recognizing faces. Two common conditions can affect this sensitive area: macular hole and epiretinal membrane (ERM).

Macular Hole

A macular hole is a small defect or gap that forms in the center of the macula. This often occurs due to age-related posterior vitreous detachment, where the vitreous gel shrinks and separates from the retina, sometimes adhering strongly to the macula and pulling a portion of it during separation, creating a hole.

Symptoms:

• Metamorphopsia: Straight lines appear wavy or curved.
• Gray or black spot in the center of vision: Making it difficult to see fine details.
• Difficulty reading: The patient may find it hard to read words or clearly see people's faces.

Macular holes are accurately diagnosed using Optical Coherence Tomography (OCT), which provides detailed cross-sectional images of the macula and shows the size and stages of the hole.

Epiretinal Membrane (ERM)

Also known as retinal pucker or "macular pucker," this is a thin layer of transparent scar tissue that grows on the inner surface of the macula. Over time, this membrane can contract and wrinkle, leading to wrinkling and distortion of the underlying retina.

Symptoms:

Symptoms are often similar to those of a macular hole but may be less severe initially and develop slowly:

• Blurred or distorted central vision.
• Wavy straight lines.
• In some cases, the patient may see a shiny line or "cellophane" over the center of vision.

Microsurgery: The Precise Solution

The treatment for both macular holes and epiretinal membranes affecting vision is surgical. An experienced retinal surgeon, such as Dr. Mahmoud Hassaan, performs a delicate procedure called vitrectomy.

Surgical Steps:

1. Vitrectomy: Three very small incisions are made in the eye wall to remove the vitreous gel, allowing the surgeon access to the retinal surface.
2. Membrane Peeling: Using highly precise microscopic instruments, the surgeon peels the internal limiting membrane (ILM) in cases of ERM or around the macular hole. This is the most sensitive step in the surgery and requires exceptional skill.
3. Gas Injection: In the case of macular hole repair, the eye is filled with a long-acting gas bubble. This bubble acts as an internal "bandage," pressing on the edges of the hole to help it close and heal.

After macular hole surgery, the patient must maintain a "face-down" position for several days to help the gas bubble effectively perform its function. In epiretinal membrane surgery, head positioning is usually not required.

Macular hole surgery is very successful in closing the hole (over 95% of cases), leading to significant improvement in central vision and reduction of distortion over time. Similarly, membrane peeling surgery leads to gradual improvement in visual acuity and reduced distortion in most patients, restoring their ability to enjoy daily activities that were affected by the disease.

For reservations and inquiries: 01002310813

Diabetic Retinopathy

Diabetic Retinopathy is one of the most serious complications of diabetes on the eye, and it is the leading cause of blindness among working-age adults worldwide. This disease arises from the long-term effects of high blood sugar levels on the tiny blood vessels that supply the retina, leading to their damage and leakage or blockage, which directly threatens vision if not managed seriously and with regular follow-up.

Causes and Mechanism

The underlying cause of diabetic retinopathy is poorly controlled blood glucose levels. Over time, high sugar weakens the walls of small blood vessels in the retina. This weakness results in two main conditions:

• Fluid and fat leakage: Blood vessels become "permeable," allowing fluids, proteins, and fats to leak into the retinal layers, causing swelling, especially in the macula, known as "diabetic macular edema."
• Blood vessel blockage: Microcapillaries may become blocked, preventing blood and oxygen from reaching parts of the retina. In response to this ischemia, the retina tries to compensate by forming new, abnormal, and fragile blood vessels.

Stages of Diabetic Retinopathy

The disease progresses through gradual stages, and early diagnosis is key to preserving vision. Dr. Mahmoud Hassaan at Al-Mashreq Eye Center supervises patients in all stages with the latest technologies.

1. Non-Proliferative Diabetic Retinopathy (NPDR)

This is the early stage and may not be accompanied by any obvious symptoms of vision impairment. It is characterized by the appearance of changes in retinal vessels including:

• Microaneurysms: Small bulges in the walls of blood vessels.
• Dot hemorrhages: Small spots of blood leaking into the retina.
• Hard Exudates: Yellowish fatty deposits resulting from fluid leakage.
• Cotton-Wool Spots: Small white areas indicating localized blood supply deficiency.

At this stage, diabetic macular edema (DME) may occur, which is the most common cause of vision deterioration in diabetic patients.

2. Proliferative Diabetic Retinopathy (PDR)

This is the advanced and more dangerous stage. Due to extensive blood supply deficiency, the retina begins to release chemical signals (such as VEGF) to stimulate the growth of new blood vessels (Neovascularization). These vessels are fragile and grow in wrong places, such as on the retinal surface or in the vitreous, causing severe complications:

• Vitreous Hemorrhage: These fragile vessels bleed easily into the vitreous fluid, leading to a "black cloud" or sudden and severe vision loss.
• Tractional Retinal Detachment: Fibrous tissue grows with these vessels and contracts over time, pulling the retina and detaching it from its place, which requires complex surgical intervention.

Accurate Diagnosis: Your Window to Retinal Health

Accurate diagnosis and determining the treatment plan rely on advanced examinations available at Al-Mashreq Eye Center:

• Dilated fundus examination: The essential step that allows the doctor to clearly see the retina, optic nerve, and blood vessels.
• Optical Coherence Tomography (OCT): It is the latest digital test for diabetic retinopathy without dye, providing high-resolution cross-sectional images of the retina, and is the most accurate test for diagnosing and measuring the degree of macular edema and determining macular thickness.
• Fluorescein Angiography (FFA): Involves injecting fluorescein dye into an arm vein and imaging the retina as the dye passes through. This test reveals areas of blood vessel leakage and areas suffering from ischemia, and is essential for guiding laser treatment.

Modern Treatment Options

Treatment methods for diabetic retinopathy have significantly evolved, and their goal is to halt disease progression and preserve remaining vision. Dr. Mahmoud Hassaan emphasizes that the treatment plan is tailored to each patient individually.

1. Strict control of medical factors: The cornerstone of treatment is strict control of HbA1c, blood pressure, and cholesterol levels. Without this control, the effectiveness of other treatments will be limited.
2. Retinal Injections for Diabetic Patients (Anti-VEGF): Considered the primary treatment for diabetic macular edema (DME) and advanced cases of proliferative retinopathy. These drugs (such as Eylea, Lucentis, and Vabysmo) inhibit the substance that causes the growth and leakage of abnormal blood vessels. Vabysmo injection has made a breakthrough due to its extended effectiveness.
3. Retinal Laser Treatment (Argon): Used in two ways:
   • Focal Laser: To cauterize tiny leaking blood vessels in cases of localized edema.
   • Pan-retinal Photocoagulation (PRP): To treat proliferative retinopathy, where thousands of laser pulses are directed to the peripheral retina to destroy ischemic areas, reducing the retina's oxygen demand, thereby inhibiting the release of substances that stimulate the growth of harmful new vessels. You can learn more about treating proliferative diabetic retinopathy (PDR) with combined argon laser and injection sessions.
4. Vitrectomy Surgery: This is resorted to in advanced cases such as severe vitreous hemorrhage that does not clear, or when tractional retinal detachment occurs.

Retinal examination for diabetic patients is not a luxury, but an imperative necessity to protect the gift of sight. The cost varies from case to case and is determined after examination.

For reservations and inquiries: 01002310813

Retinal Detachment

Retinal detachment is an emergency and serious medical condition that occurs when the light-sensitive neural cell layer (retina) separates from the back eye wall that supplies it with oxygen and nutrients. The longer the detachment lasts, the greater the risk of permanent vision loss, making prompt diagnosis and treatment crucial for saving the eye.

Types and Causes of Retinal Detachment

Doctors classify retinal detachment into three main types, each with a different mechanism:

1. Rhegmatogenous Retinal Detachment

This is the most common type. It occurs as a result of a retinal tear or hole, allowing vitreous fluid to pass through this tear and accumulate behind the retina, separating it from its place. Major risk factors include:

• High myopia.
• Aging and posterior vitreous detachment (PVD).
• Direct eye injuries and trauma.
• Family history of the disease.
• Previous eye surgeries such as cataract surgery.

2. Tractional Retinal Detachment

This type occurs when fibrous tissue (scar tissue) forms on the retinal surface, and as this tissue contracts, it pulls and detaches the retina from its position. This type is mainly seen in advanced stages of diabetic retinopathy or after penetrating eye injuries.

3. Exudative Retinal Detachment

This is the least common type, occurring without any tears or holes. The cause here is the accumulation of fluid behind the retina due to other diseases such as severe inflammation (choroiditis), eye tumors, or vascular diseases. Treatment for this type focuses on treating the underlying cause.

Diagnosis and Treatment: A Race Against Time

Rapid diagnosis is key to success. Dr. Mahmoud Hassaan carefully examines the fundus after dilating the pupil to determine the location and type of detachment. If there are opacities preventing clear vision (such as hemorrhage or dense cataracts), ocular ultrasound (B-Scan) is used to accurately assess the retinal condition.

Treatment always aims to reattach the retina and close any existing tears. The surgical method varies according to each case:

• Retinal Laser Photocoagulation or Cryopexy: These procedures are used to treat retinal tears *before* complete detachment occurs, by creating a "weld" around the tear to prevent fluid leakage.
• Pneumatic Retinopexy: A gas bubble is injected into the eye to push the detached retina back into place, and then the tear is secured with laser or cryopexy. This procedure requires the patient to maintain a specific head position for several days.
• Scleral Buckle Surgery: A classic and very effective surgery, where a silicone band is placed around the outside of the eyeball (sclera) to bring the eye wall closer to the detached retina, relieving traction and helping to close the tear.
• Vitrectomy Surgery: This is the most common surgery today, especially in complex cases. The surgeon removes the vitreous, repositions the retina, treats tears with an internal laser, and then fills the eye with a gas bubble or silicone oil to stabilize the retina during the healing period.

Success Rates and Post-Surgery Instructions

Thanks to modern techniques applied by experienced retinal surgeons like Dr. Mahmoud Hassaan, the anatomical success rate (reattaching the retina) exceeds 90%. However, the extent of vision recovery largely depends on whether the macula was detached before surgery and the duration of the detachment. The faster the intervention, the better the chance of vision recovery, but can retinal detachment cause blindness? Yes, if neglected.

The post-surgical period is crucial for treatment success. Key instructions include:

• Strict adherence to the head position after retinal detachment surgery with gas injection as directed by the doctor.
• Completely avoiding air travel if gas is present in the eye, as the gas can expand and cause a catastrophic increase in eye pressure.
• Avoiding strenuous physical activity and heavy lifting.

The cost of retinal detachment surgery in Egypt {{YEAR}} varies based on the type of surgery and materials used (gas or silicone), and is accurately determined after a comprehensive examination at Al-Mashreq Eye Center.

For reservations and inquiries: 01002310813

Macular Hole and Epiretinal Membrane (ERM)

The macula, or fovea, is the most sensitive part of the retina and is responsible for the sharp central vision we use for reading, recognizing faces, and seeing fine details. Two common conditions can affect this vital part: macular hole and epiretinal membrane (ERM), both leading to distortion and gradual loss of central vision.

1. Macular Hole

It is a complete tear or gap that forms in the macula tissue. How does a viewing error cause loss of reading ability? Simply, when this hole forms, it creates a "blind spot" directly in the center of vision.

Causes and Symptoms:

The most common cause is aging and associated changes in the vitreous body. Over time, the vitreous gel shrinks and begins to separate from the retina, a natural process called posterior vitreous detachment (PVD). In some cases, the vitreous body remains strongly attached to the macula and pulls it during its separation, leading to its tearing and the formation of a hole. Macular holes can also occur as a result of severe eye injuries.

Key symptoms include:

• Central vision distortion (Metamorphopsia), where straight lines appear wavy or curved.
• Blurry central vision.
• A fixed gray or black spot in the center of the visual field.

2. Epiretinal Membrane (ERM)

Also known as "macular pucker," it is a thin layer of transparent scar tissue that forms on the surface of the macula. Over time, this membrane can contract and wrinkle, leading to wrinkling of the underlying retina.

Causes and Symptoms:

Like a macular hole, the most common cause is aging and vitreous detachment. It can also form as a reaction to other diseases such as eye infections, retinal vein occlusions, or after previous retinal surgeries. Symptoms develop slowly and are similar to early macular hole symptoms, the most important of which is vision distortion (seeing straight lines as wavy lines) and blurry central vision.

Accurate Diagnosis with Microsurgery

Accurate diagnosis is the cornerstone of successful treatment. Dr. Mahmoud Hassaan relies on Optical Coherence Tomography (OCT) as a primary diagnostic tool. This painless examination provides high-resolution cross-sectional images of the macula, allowing for:

• Confirmation of a macular hole, determining its size and stage.
• Clear visualization of the epiretinal membrane and assessment of its effect on macular shape.
• Exclusion of other diseases that may cause similar symptoms.

Treatment: Vitrectomy and Membrane Peeling

The only effective treatment for both macular holes and epiretinal membranes is precise microsurgical intervention. The surgery is performed under a microscope and includes the following steps:

1. Vitrectomy Surgery: The surgeon makes three tiny incisions (less than 1 mm) in the eye wall to remove the vitreous gel, providing access to the retinal surface and relieving any traction on the macula.
2. Internal Limiting Membrane (ILM) Peeling: This is the most important and precise step. Using extremely fine microscopic instruments, the surgeon peels and removes the epiretinal membrane (in ERM cases), or peels the thin membrane surrounding the hole (ILM) to increase its chances of closure (in macular hole cases).
3. Gas Injection (Tamponade): In macular hole surgery, the eye is filled with a long-acting gas bubble at the end of the surgery. This bubble acts as an internal "bandage" that presses on the edges of the hole to help it heal and close.

Recovery and Expected Results

After macular hole surgery, the patient must maintain a face-down position for several days to allow the gas bubble to press on the macula effectively. However, after epiretinal membrane surgery, there are usually no strict head position restrictions.

Macular hole surgery boasts a success rate of over 90% in closing the hole, which halts vision deterioration and often leads to significant improvement in visual acuity and reduced distortion over several months. Similarly, membrane peeling surgery results in gradual improvement in visual acuity and reduced distortion for most patients, allowing them to regain the ability to enjoy daily activities affected by the disease. The cost varies from case to case and is determined after examination.

For reservations and inquiries: 01002310813

Retinal Vascular Occlusions: Sudden Eye Strokes

The retina is a highly active neural tissue that relies on a delicate network of blood vessels for its oxygen and vital nutrient supply. Any blockage in these vessels, whether arterial or venous, is a serious medical condition known as an "eye stroke" or "retinal stroke," and can lead to permanent vision loss if not addressed quickly and professionally.

Difference Between Retinal Artery and Vein Occlusion

The fundamental difference lies in the nature of the affected blood vessel and its impact on vision:

• Retinal Artery Occlusion: This is an "eye stroke." Arteries are responsible for transporting oxygenated blood to the retina. When the central artery or one of its branches is blocked, the blood supply is suddenly cut off, leading to the death of retinal nerve cells within minutes to hours. The main symptom is sudden, severe, and painless vision loss, as if a black curtain has been drawn over the eye.
• Retinal Vein Occlusion: Veins are responsible for draining deoxygenated blood from the retina. When a vein is blocked, pressure builds up within the delicate blood vessels, leading to hemorrhage and fluid leakage into the retinal layers, known as macular edema. Vision loss here is more gradual compared to arterial occlusion, and the patient usually complains of blurred and distorted vision (seeing straight lines as wavy).

Causes and Risk Factors

Retinal vascular occlusions are closely associated with other systemic diseases. The most important causes of retinal vein occlusion and risk factors include:

• Chronic high blood pressure.
• Diabetes.
• High cholesterol and blood fat levels.
• Cardiovascular diseases.
• Certain blood disorders that increase clotting tendency.
• Glaucoma.

Diagnosis and Treatment

Accurate diagnosis at Al-Mashreq Eye Center relies on a comprehensive clinical fundus examination, in addition to advanced tests such as Optical Coherence Tomography (OCT) to determine the size and location of edema, and Fluorescein Angiography (FFA) to assess the circulatory status and determine the location of the occlusion. Dr. Mahmoud Hassaan explains that the primary goal of treatment, especially in cases of Central Retinal Vein Occlusion (CRVO), is to control macular edema and prevent complications.

The most effective treatment is intravitreal injection with anti-vascular endothelial growth factor (Anti-VEGF) agents, which work to dry up the edema and prevent the growth of harmful blood vessels, helping to restore a significant portion of lost vision and preserve it. In some cases, retinal laser may be used to control the growth of abnormal blood vessels.

For reservations and inquiries: 01002310813

Hereditary and Rare Retinal Diseases

Hereditary retinal diseases represent a wide group of conditions resulting from genetic mutations that affect the function or structure of retinal cells. These diseases are often chronic and progressive, appearing at different ages, from childhood to middle age. Despite their rarity compared to diseases like diabetic retinopathy, they pose a significant challenge for patients and their families.

Retinitis Pigmentosa (RP)

Retinitis Pigmentosa (RP) is the most common example of hereditary retinal diseases. It is not a single disease, but a group of genetic disorders that cause progressive degeneration of photoreceptor cells in the retina (rods and cones).

Symptoms and Stages:

• Night Blindness: This is the first and most distinctive symptom, where the patient experiences severe difficulty seeing in dim light or when moving from a bright to a dark environment.
• Loss of Peripheral Visual Field: As the disease progresses, the patient gradually loses side vision, leading to what is known as "tunnel vision," where they can only see through a small central spot.
• Photophobia and Loss of Color Vision: In advanced stages, central vision and color vision may be affected as cone cells degenerate.

Advanced Diagnosis and Genetic Role

The diagnosis of hereditary retinal diseases relies on a multifaceted approach followed by Dr. Mahmoud Hassaan to accurately determine the nature and stage of the disease. This includes:

• Fundus Examination: Where the doctor can see characteristic signs of the disease, such as the appearance of pigment deposits resembling "bone spicules" in the peripheral retina in cases of retinitis pigmentosa.
• Visual Field Test: To assess the extent of peripheral vision loss and determine the degree of "tunnel vision."
• Electrophysiology Tests: Electroretinography (ERG) is a crucial tool, measuring the electrical response of retinal cells to light. In RP patients, the rod cell response is very weak or absent.
• Genetic Testing: Genetic testing plays an increasingly important role in the field of hereditary retinal diseases. It not only confirms the diagnosis but also identifies the causative genetic mutation, which helps in providing accurate genetic counseling to the family and opens the door to promising future gene therapies.

To date, there is no cure for most hereditary retinal diseases, but medical management focuses on slowing disease progression, using certain vitamins and nutritional supplements to strengthen the retina under strict medical supervision, providing visual aids, and offering psychological support to the patient and helping them adapt to their condition.

For reservations and inquiries: 01002310813

Intravitreal Injections

The technique of intravitreal injections has revolutionized the treatment of many retinal diseases that inevitably led to vision loss in the past. This technique relies on delivering precise doses of medication directly into the vitreous cavity of the eye, ensuring the highest possible concentration of treatment reaches the retina while minimizing side effects on the rest of the body. Although the idea of a "needle in the eye" may seem frightening, the procedure is very quick, almost painless thanks to topical anesthetic drops, and is performed in a completely sterile environment within the doctor's office.

Types of Retinal Injections and Their Indications

The medications used in intravitreal injections are classified into main categories based on their mechanism of action:

1. Anti-vascular endothelial growth factor (Anti-VEGF): This is the most commonly used category. VEGF protein stimulates the growth of new, abnormal, and fragile blood vessels, and increases fluid leakage (edema) from existing blood vessels. Anti-VEGF drugs stop this effect. Among the most popular of these drugs are:
   • Eylea and Lucentis: Classic generations that have proven their effectiveness over many years.
   • Vabysmo: Vabysmo injection in the eye is a modern breakthrough, as it works through a dual mechanism to target two disease-causing factors (VEGF and Ang-2), which may reduce the number of injections a patient needs in the long term. You can learn more about the difference between Eylea and Vabysmo injections.
2. Corticosteroids: These drugs act as powerful anti-inflammatories. They are used in cases of edema resulting from inflammation or conditions that do not respond well to Anti-VEGF drugs. They can be injected as slow-release implants like Ozurdex implant, which releases the drug slowly over several months.

Main indications for retinal injections:

• Diabetic Macular Edema.
• Wet Age-related Macular Degeneration (Wet AMD).
• Macular edema resulting from retinal vein occlusion.
• Proliferative diabetic retinopathy.

The experienced retinal surgeon, such as Dr. Mahmoud Hassaan, develops a personalized treatment protocol for each patient, usually starting with monthly injections for several months, then gradually spacing out the injections according to the eye's response, which is accurately monitored using the latest retinal imaging devices. This is known as the "Treat-and-Extend" protocol.

For reservations and inquiries: 01002310813

Retinal Laser Photocoagulation

Retinal laser treatment, or photocoagulation, is one of the oldest and most important tools in the retinal surgeon's arsenal. It relies on using a high-energy, precisely directed light beam to create small, controlled thermal burns in the retinal layers. This therapeutic burn aims to destroy abnormal tissues, stop leakage, or create a scar to firmly reattach the retina.

Types of Retinal Lasers and Their Applications

The type of laser used and its purpose vary depending on the medical condition. At Al-Mashreq Eye Center, the green argon laser is primarily used for the following applications:

• Pan-Retinal Photocoagulation (PRP): This is the primary treatment for proliferative diabetic retinopathy (PDR). In this stage of the disease, the peripheral retina suffers from severe oxygen deficiency, which stimulates it to secrete substances that promote the growth of new, fragile, and chaotic blood vessels on the retinal surface and optic nerve. These vessels are prone to bleeding and fibrosis. The laser creates hundreds or thousands of burns on the peripheral retina "diseased" areas to reduce their oxygen consumption, which stops the secretion of these harmful substances and leads to the regression of abnormal blood vessels and prevention of serious complications such as vitreous hemorrhage and tractional retinal detachment.
• Laser Retinopexy: When a retinal tear or hole occurs, there is a high risk of vitreous fluid leaking through it and causing retinal detachment. The laser creates a "weld" around the tear, forming a strong scar that prevents retinal detachment. This procedure is preventative and crucial in avoiding the need for major surgery later. You can learn more about symptoms of retinal tear and its laser treatment.
• Focal/Grid Laser: Formerly used to treat specific leakage areas in diabetic macular edema. Although injections are now the primary option, focal laser still has a role in some specific cases.

How is a Retinal Laser Session Performed?

A retinal laser procedure is an outpatient procedure performed in the clinic. The patient sits in front of the laser machine, and drops are administered to dilate the pupil and anesthetize the eye. The doctor places a special contact lens on the eye's surface to precisely direct the laser beam to the target areas. During the session, the patient sees bright flashes of light. They may feel some mild stinging, but the procedure is generally painless. The session takes 10 to 20 minutes. The patient may need several sessions, especially in the case of pan-retinal photocoagulation (PRP). After the session, vision is temporarily blurry due to pupil dilation and light glare, but it gradually returns to normal within hours.

Vitreoretinal Surgery

Vitreoretinal surgery represents the pinnacle of ophthalmic interventions and requires exceptional surgical skill, precise microscopic techniques, and highly advanced equipment, all of which are provided by Dr. Mahmoud Hassaan at Al-Mashreq Eye Center, considered one of the best retinal surgery centers in Cairo.

Vitrectomy Surgery

The cornerstone of all retinal surgeries is vitrectomy surgery. The vitreous body is a gel-like substance that fills the posterior cavity of the eye. In many diseases, this gel becomes opaque (due to hemorrhage), causes traction on the retina (leading to its tearing or detachment), or obstructs the surgeon's access to the retina for repair. The goal of the surgery is to remove this gel using highly precise instruments.

Modern Sutureless Surgical Techniques:

Vitreous surgery has evolved tremendously. Instead of large incisions that required surgical suturing, operations are now performed through very small incisions (less than half a millimeter) that self-seal. This technique is known as (MIVS - Micro-Incisional Vitrectomy Surgery) and uses instruments of different sizes (23G, 25G, 27G). The larger the gauge, the smaller the instrument and incision size. Sutureless vitrectomy offers many benefits to the patient, including less pain, less inflammation after surgery, and faster vision recovery.

Indications for Vitrectomy Surgery

Dr. Mahmoud Hassaan resorts to this advanced surgery to treat a wide range of conditions, most importantly:

• Retinal Detachment: Especially in complex cases involving large tears or fibrosis.
• Vitreous Hemorrhage: When a hemorrhage does not clear on its own, especially in diabetic patients.
• Macular Hole: To relieve the traction causing the hole and allow it to heal.
• Epiretinal Membrane: To peel the membrane that causes retinal wrinkling and distorted vision.
• Complications of advanced diabetic retinopathy: Such as tractional retinal detachment.
• Removal of foreign bodies from inside the eye after accidents and injuries.
• Removal of silicone oil from previous surgeries.

Internal Tamponade Agents: Gas and Silicone

After removing the vitreous, the eye must be filled with a substitute substance to support the retina and keep it in place during the healing period. These substances are called "internal tamponade." The two main options are:

• Gas Bubble:
  • Mechanism: A special gas bubble (such as SF6 or C3F8) is injected into the eye. The surface tension of the bubble presses on the retina and stabilizes it. The body gradually absorbs this gas over weeks. During this period, it is very important to adhere to a specific head position after retinal detachment surgery as instructed by the doctor, to ensure that the bubble presses on the correct spot on the retina.
  ⚠️ Severe Warning: Air travel after retinal surgery with gas injection is strictly prohibited. Changes in atmospheric pressure can cause the gas bubble to expand dangerously, leading to a catastrophic increase in eye pressure that can cause immediate blindness.
• Silicone Oil Injection: This is a clear, heavy fluid used as a long-term tamponade in complex or recurrent retinal detachment cases. Unlike gas, it is not absorbed by the body and requires another surgical procedure to remove it after several months, once the retina is completely stable. It is essential to adhere to the removal appointment to avoid the risks of silicone emulsification and its complications in the long term.

Vitreoretinal surgeries are among the most precise and advanced medical procedures, and their success significantly depends on the surgeon's experience and the availability of advanced technology, both of which are key factors ensured by Al-Mashreq Eye Center to provide the best possible outcomes for patients.

For reservations and inquiries: 01002310813

Retinal Vascular Occlusions: Sudden Eye Strokes

The retina, like any living tissue in the body, relies on a delicate network of blood vessels to supply it with oxygen and nutrients and to remove waste products. Arteries carry oxygenated blood to the retina, while veins drain it. Any blockage in these vessels, whether arterial or venous, is a serious medical condition known as an "eye stroke" or "retinal stroke," and can lead to acute and permanent vision loss if not managed quickly and professionally.

Retinal Artery Occlusion: An Eye Stroke

Central Retinal Artery Occlusion (CRAO) or one of its branches (BRAO) is one of the most serious ophthalmic emergencies. It occurs when a small blood clot (embolus) originating from another part of the body, such as the heart or carotid artery in the neck, gets lodged inside a narrow artery supplying the retina, completely cutting off oxygen supply to its sensitive nerve cells.

Symptoms: The main symptom is sudden, complete, and painless vision loss in one eye, as if a "black curtain has been drawn" over the eye in seconds. This loss is not accompanied by any pain or redness, which unfortunately may cause some people to delay seeking medical help.

Diagnosis and Treatment: Diagnosis relies on fundus examination, where the doctor sees a characteristic sign known as a "cherry-red spot." Unfortunately, treatment options are very limited and depend on reaching the doctor within the first few very short hours. The primary goal thereafter is to identify the source of the clot to prevent its recurrence in the other eye or, more importantly, in the brain (causing a stroke).

Retinal Vein Occlusion: Sudden Venous Congestion

Retinal vein occlusion occurs when a clot forms inside one of the retinal veins, preventing blood drainage and leading to severe "congestion," hemorrhage, and fluid leakage within the retinal layers. It is more common than arterial occlusion and is often associated with systemic diseases such as high blood pressure, diabetes, and high blood lipid levels.

Symptoms: Symptoms vary depending on the location of the occlusion. In Central Retinal Vein Occlusion (CRVO), symptoms are more severe, including severe and sudden blurred vision. In branch retinal vein occlusion (BRVO), vision impairment may be limited to a specific part of the visual field. The main problem resulting from venous occlusion is not direct cell death, but long-term complications such as macular edema and the growth of abnormal blood vessels.

Diagnosis and Treatment: Diagnosis is made by fundus examination, and OCT scans are used to determine and evaluate the degree of macular edema. The treatment provided by Dr. Mahmoud Hassaan at Al-Mashreq Eye Center focuses on managing these complications. The primary treatment is intravitreal injection with anti-vascular endothelial growth factor (Anti-VEGF) agents, which work to dry up the edema and prevent the growth of harmful blood vessels, helping to restore a significant portion of lost vision and preserve it. In some cases, retinal laser may be used to control the growth of abnormal blood vessels.

For reservations and inquiries: 01002310813

Hereditary and Rare Retinal Diseases

Inherited Retinal Dystrophies (IRDs) represent a complex group of conditions resulting from genetic mutations that lead to progressive degeneration of retinal cells and vision loss. These diseases vary in severity, age of onset, and patterns of visual impairment. Accurate and early diagnosis is crucial for guiding the patient, providing genetic counseling to their family, and exploring future treatment options.

Retinitis Pigmentosa (RP)

Retinitis Pigmentosa is the most common and prevalent hereditary retinal disease. This disease primarily affects rod cells, which are responsible for night and peripheral vision, then extends to affect cone cells, which are responsible for central vision and color perception in advanced stages.

• Early Symptoms: The classic first symptom is "night blindness" or severe difficulty seeing in dim light, which may appear in childhood or adolescence. This is followed by a gradual loss of peripheral visual field, causing the patient to feel as if they are looking through a tunnel (Tunnel Vision), and frequently bumping into objects around them.
• Late Symptoms: As the disease progresses over years, the visual "tunnel" gradually narrows until central vision is affected, hindering the ability to read and recognize faces.

Diagnosis: Diagnosis relies on family history and characteristic symptoms. The retinal surgeon confirms the diagnosis through:

• Fundus Examination: Where characteristic pigment deposits resembling "bone spicules" appear in the peripheral retina.
• Visual Field Test: To document the extent of peripheral vision loss.
• Electroretinography (ERG): A crucial test that measures the electrical response of retinal cells to light. In RP cases, the rod cell response is very weak or absent.
• Genetic Testing: Plays an increasingly important role in identifying the causative genetic mutation, which opens the door to targeted gene therapies in the future.

Disease Management and Future Prospects

Currently, there is no cure for the majority of retinitis pigmentosa cases, but medical management aims to slow degeneration and manage complications. The doctor may recommend specific doses of vitamin A under strict medical supervision, wearing sunglasses for protection from UV rays, and treating any associated complications such as cataracts. Global research promises hopeful breakthroughs in gene therapy and retinal implant surgery, which may provide some vision for the blind in the future.

For reservations and inquiries: 01002310813

Intravitreal Injections

Intravitreal injections have revolutionized the treatment of many retinal diseases that inevitably led to vision loss in the past. This technique relies on delivering precise doses of medication directly into the vitreous body inside the eye, ensuring the highest possible concentration of treatment reaches the retina while minimizing side effects on the rest of the body. Although the idea of a "needle in the eye" may seem frightening, the procedure is very quick, almost painless thanks to topical anesthetic drops, and is performed in a completely sterile environment within the doctor's office.

Types of Retinal Injections and Their Indications

The most famous and effective family of injected medications are "Anti-vascular endothelial growth factor" (Anti-VEGF) agents. In disease states, this factor (VEGF) stimulates the growth of new, abnormal, and fragile blood vessels, and increases fluid leakage from them, leading to retinal edema and swelling. Anti-VEGF drugs suppress this factor, causing harmful vessels to shrink and edema to dry up.

Most common types of injections:

• Eylea and Lucentis: Leading drugs that have proven effective over years in treating retinal edema.
• Vabysmo: The latest generation of injections, characterized by a dual mechanism of action targeting two disease-causing pathways (VEGF and Ang-2), which may allow for extending the intervals between injection sessions and reducing the total number of injections a patient needs. You can read more about the difference between Eylea and Vabysmo injections.
• Corticosteroid implants (Ozurdex): A small, biodegradable implant injected into the eye that slowly releases corticosteroids over several months, used in cases of resistant edema or inflammation-related edema.

Retinal injections are primarily used to treat:

• Wet Age-related Macular Degeneration (Wet AMD).
• Diabetic Macular Edema (DME).
• Macular edema resulting from retinal vein occlusion.
• Proliferative diabetic retinopathy.

The experienced retinal surgeon, such as Dr. Mahmoud Hassaan, develops a personalized treatment protocol for each patient, usually starting with monthly injections for several months, then gradually spacing out the injections based on the eye's response, which is accurately assessed via OCT scans. This is known as the "Treat-and-Extend" protocol.

For reservations and inquiries: 01002310813

Retinal Laser Photocoagulation

Laser treatment is one of the oldest and most important tools in the retinal surgeon's arsenal. The laser does not aim to improve vision directly, but it is an extremely important therapeutic and preventive procedure that works by creating precise and controlled thermal burns in the retinal layers to achieve a specific therapeutic goal, often to prevent further deterioration or complete loss of vision.

Types of Retinal Lasers and Their Applications

Laser treatment is an outpatient procedure performed in the clinic. After dilating the pupil and applying anesthetic drops, the patient sits in front of the laser machine and the doctor places a special contact lens on the eye's surface to precisely direct the laser beam. The patient sees flashes of bright light during the session. The types of laser vary depending on its purpose:

1. Pan-Retinal Photocoagulation (PRP):
   • Goal: This is the standard treatment for proliferative diabetic retinopathy. In this condition, the peripheral retina suffers from severe oxygen deficiency, causing it to secrete substances that stimulate the growth of new, fragile, and chaotic blood vessels on the retinal surface and optic nerve. These vessels are prone to bleeding and fibrosis.
   • Mechanism: The doctor applies hundreds or thousands of laser burns to the peripheral retina (away from the macula), destroying these ischemic areas. This reduces the retina's "hunger" for oxygen, thereby decreasing the secretion of harmful substances, causing the new blood vessels to shrink, and reducing the risk of bleeding and retinal detachment.
2. Laser Retinopexy:
   • Goal: This is a crucial preventive procedure. When a retinal tear or hole occurs, there is a high risk of vitreous fluid leaking through it, causing retinal detachment.
   • Mechanism: The doctor encircles the edges of the tear with two or three rows of laser burns. Within weeks, strong scars form that firmly attach the retina to the underlying layer, "welding" and sealing the tear and preventing retinal detachment. This simple in-office procedure avoids the need for major and complex surgery later. You can learn more about the steps of laser treatment for retinal holes.

The cost of retinal laser treatment varies depending on the condition and the required procedure, and is determined after a thorough examination at Al-Mashreq Eye Center.

For reservations and inquiries: 01002310813

Vitreoretinal Surgery

Vitreoretinal surgery represents the pinnacle of delicate eye surgeries, requiring extreme skill, extensive experience, and advanced equipment. These operations are performed to treat the most complex and dangerous conditions that threaten permanent vision loss, such as retinal detachment, dense vitreous hemorrhage, macular holes, and advanced diabetic complications. Dr. Mahmoud Hassaan is one of the distinguished surgeons in this field, relying on the latest global technologies at Al-Mashreq Eye Center.

Vitrectomy Surgery

Vitrectomy surgery is the cornerstone of most retinal surgeries. It involves removing the vitreous gel that fills the eye cavity. This operation is performed to achieve several goals:

• Removal of opacities: Such as dense vitreous hemorrhage that completely obscures vision.
• Removal of traction and fibrosis: In cases like tractional retinal detachment (Tractional RD) or epiretinal membranes, the surgeon removes the vitreous and fibrous membranes that pull on the retina, causing it to wrinkle or detach.
• Access to the retina: Removing the vitreous allows the surgeon space to work directly on the retinal surface to repair tears or remove delicate membranes.

Modern Techniques: Vitrectomy surgeries have evolved tremendously. Instead of large incisions that required suturing, operations are now performed using "micro-incisional surgery" (MIVS) techniques with small-diameter instruments (23G, 25G, or even 27G). This technique, known as sutureless vitrectomy, is characterized by faster wound healing, reduced post-operative irritation, and quicker patient recovery.

Internal Retinal Tamponade

After repairing the retina, it must be kept in place to heal. The eye cannot be left empty, so the surgeon fills the eye cavity with a substance that acts as an "internal splint" (tamponade) to hold the retina in place. There are two main types:

1. Gas Bubble:
   • Mechanism: A special gas bubble (such as SF6 or C3F8) is injected into the eye. The surface tension of the bubble presses on the retina and stabilizes it. The body gradually absorbs this gas over weeks.
   • Crucial Instructions: The success of the operation depends entirely on the patient's adherence to a specific head position (often face-down) for days or weeks, to ensure that the bubble floats and presses on the correct spot on the retina.
   • Travel Warning: Air travel or ascending to high altitudes is strictly prohibited as long as gas is present in the eye, as changes in atmospheric pressure can cause the gas to expand dangerously, leading to a catastrophic increase in eye pressure that could destroy the optic nerve.
2. Silicone Oil Injection: This is a clear, heavy fluid used as a long-term support for the retina in very complex cases (such as recurrent detachments or giant retinal tears). Unlike gas, it is not absorbed by the body, and therefore requires another surgical procedure to remove it after several months, once the retina is completely stable. It is essential to adhere to the removal appointment to avoid the risks of silicone emulsification and its complications in the long term.

Retinal and vitreous surgeries are precise procedures that depend greatly on the surgeon's experience and the available advanced equipment. At Al-Mashreq Eye Center, Dr. Mahmoud Hassaan ensures the use of the latest technologies to guarantee the highest possible success and safety rates, while providing clear instructions to the patient regarding post-operative care to ensure the best possible visual outcomes.

For reservations and inquiries: 01002310813

Modern Diagnostic Tests for Retinal Diseases

Accurate diagnosis of retinal and vitreous diseases relies on a combination of the physician's clinical expertise and advanced technology. At Al-Mashreq Eye Center, Dr. Mahmoud Hassaan utilizes the latest global diagnostic equipment to provide a comprehensive and precise picture of the internal eye condition, allowing for a personalized treatment plan for each patient. These tests are painless and quick, yet provide invaluable information.

Optical Coherence Tomography (OCT & OCTA)

Optical Coherence Tomography (OCT) is like a "CT scan" for retinal layers, providing high-resolution, micron-level images of each of the ten retinal layers. This examination is essential for diagnosing and monitoring diseases such as:

• Diabetic Macular Edema.
• Age-related Macular Degeneration (dry and wet types).
• Macular holes and epiretinal membranes.
• Monitoring the effect of eye injections on retinal thickness.

As for OCT Angiography (OCTA), it represents a more recent breakthrough, allowing visualization of microscopic blood vessels in the retina and assessment of blood flow without the need for injecting dye into the patient's vein. The latest digital retinal examination for diabetic patients without dye is an ideal option for patients with dye allergies or kidney function issues. The cost of OCT and dye angiography for the retina varies depending on the specific test required.

Ultra-Widefield Fluorescein Angiography (UWF-FFA)

Fluorescein Angiography (FFA) remains a pivotal test for evaluating retinal circulation. Fluorescein dye is injected into an arm vein, and a series of rapid images of the eye are captured as the dye passes through its blood vessels. This test helps detect:

• Leakage areas (edema) in cases of diabetic retinopathy.
• Abnormal and fragile blood vessels that may cause bleeding.
• Areas of ischemia that require laser treatment.
• Diagnosis of inflammatory retinal diseases and vein occlusions.

At Al-Mashreq Eye Center, we use Ultra-Widefield (UWF) retinal imaging technology, which allows imaging of over 80% of the retinal surface in a single image, compared to only 30-40% with traditional devices. This provides a comprehensive view of the distant peripheral retina, which is vital in conditions such as diabetic retinopathy and high myopia.

Ocular Ultrasound (B-Scan Ultrasound)

When there is opacity in the transparent media of the eye, such as dense cataracts or severe vitreous hemorrhage, direct visualization of the retina becomes impossible. In these cases, we resort to ocular ultrasound (B-Scan). This technique works on the same principle as ultrasound used in other parts of the body, emitting ultrasonic waves and receiving their echoes to create a two-dimensional image of the posterior eye components. This enables us to diagnose conditions like retinal detachment or the presence of tumors or foreign bodies even when vision is absent.

Other Specialized Tests

• Visual Field Test: Measures the patient's peripheral vision, an essential test for diagnosing and monitoring diseases like glaucoma and retinitis pigmentosa, and assessing any optic nerve damage.
• Electroretinography (ERG) / Visual Evoked Potentials (VEP): These tests measure the electrical response of the retinal cells and optic nerve when stimulated by light. They are used in the diagnosis of complex genetic and inflammatory diseases that are not clearly observable in other tests. You can learn more about ERG and VEP electrophysiology tests of the eye and retina.
• Biometry: Before cataract surgery, an automated eye lens measurement device is used to precisely calculate the power of the intraocular lens to be implanted, ensuring the best possible vision after surgery.
• Hess Screen: Used to evaluate strabismus, eye muscle palsy, and double vision, especially after eye injuries or in neurological conditions.

The availability of this comprehensive suite of comprehensive eye examination and early diagnosis services ensures that patients receive the correct diagnosis from the first visit, avoiding any delay in initiating appropriate treatment.

For reservations and inquiries: 01002310813

The Relationship Between Cataracts and Retinal Diseases

Patients often ask about the relationship between cataracts (clouding of the eye's natural lens) and retinal diseases. In reality, the relationship is close and complex, requiring the expertise of a surgeon specialized in both fields to manage it effectively. This relationship can be summarized in two main directions:

1. Retinal Diseases and Surgeries Can Cause Cataracts

Some retinal treatments are essential for saving vision, but they can accelerate the development of cataracts. Common examples include:

• After vitrectomy surgery: The effect of retinal surgeries on future cataract development is common, especially in older individuals. Changes in the internal eye environment after surgery accelerate the aging of the natural lens.
• After silicone oil injection: Prolonged presence of silicone oil inside the eye can lead to cataract formation, necessitating surgical removal along with or after the oil removal.
• Use of corticosteroid drops or injections: Treatment of certain retinal inflammations or edemas may require the use of corticosteroids, a known side effect of which is accelerated cataract development.

2. Cataracts Can Mask Retinal Diseases

When a cataract is very dense (mature), it acts as a barrier preventing the doctor from clearly examining the fundus and retina. In such cases, there may be an underlying serious retinal disease (such as diabetic retinopathy or retinal detachment) that goes undiagnosed. This is where the importance of ocular ultrasound (B-Scan) before surgery becomes apparent, to rule out any problems behind the opaque lens.

Challenges of Combined or Staged Cataract Surgery in the Presence of Retinal Diseases

Performing cataract surgery on a patient with retinal problems is not the same as performing it on a healthy patient. It requires special precautions and high surgical expertise, which is Dr. Mahmoud Hassaan's specialization. These challenges include:

• Diabetic retinopathy patients: Postoperative inflammation can exacerbate macular edema. Therefore, the retinal condition must be controlled with injections or laser before surgery, with an intensive treatment protocol afterward. Cataract treatment in diabetic patients with retinopathy is an advanced surgery requiring meticulous planning.
• Patients with weakened lens zonules: Some retinal diseases or previous injuries can cause weakness in the ligaments that hold the lens in place, making surgery more complex and requiring special instruments such as a capsular tension ring (CTR).
• After previous retinal surgeries: An eye that has undergone previous surgery is more sensitive and may require special techniques to safely remove cataracts.
💡 Information: In complex cases, Dr. Mahmoud Hassaan may decide to perform a combined surgery to remove cataracts and address the retinal problem (such as membrane removal or silicone injection) in the same operation, saving the patient the trouble of undergoing two separate surgeries.

For reservations and inquiries: 01002310813

Most Common Patient Complaints and Their Symptoms: When to Worry?

The journey of diagnosing retinal diseases always begins with the patient's complaint. Some symptoms may be minor and transient, while others may be a warning sign of an emergency medical condition requiring immediate intervention. Here is a guide to the most common complaints and what they might mean:

1. Floaters

These are points, threads, or cobweb-like shapes that float in the visual field and are more noticeable when looking at a light-colored surface. In most cases, these are a natural result of posterior vitreous detachment with age. However, if they appear suddenly and in large numbers, or are accompanied by flashes of light, they may be a sign of a retinal tear. It is important to know when floaters are normal and when they indicate danger.

2. Flashes of Light

Patients describe these as "camera flashes" or "lightning" appearing in the side of the visual field. These flashes occur due to vitreous traction on the retinal surface. This traction may be normal, but if the flashes are constant, recurrent, or new, it is a strong warning sign of a potential retinal tear, which is the step preceding retinal detachment.

3. A Black Curtain or Shadow Obscuring Vision

⚠️ Emergency Alert: This symptom is the most serious of all and often means retinal detachment. The black curtain is the detached part of the retina that has lost its function. You must go to the nearest eye emergency department or contact a retinal surgeon immediately, as every hour of delay reduces the chances of vision recovery.

Seeing a black curtain obscuring the eye is a red alert that should never be ignored.

4. Distorted Vision (Metamorphopsia)

The patient sees straight lines (such as door frames or lines of text) as wavy or crooked. This symptom is very characteristic of macular diseases, such as wet age-related macular degeneration, diabetic macular edema, or the presence of an epiretinal membrane. Sudden distorted vision is an accurate indicator of a problem in the core of the retina that requires quick diagnosis and treatment.

5. A Dark or Opaque Spot in the Center of Vision

This is a complaint of a fixed "hole" or spot in the macula that interferes with reading or facial recognition. This is the main sign of a macular hole or an advanced stage of dry macular degeneration. It is a problem that has a devastating impact on quality of life and often requires precise surgical intervention.

6. Sudden Blurriness or Haziness of Vision

The causes of sudden blurry or hazy vision can be numerous, but in the context of retinal diseases, it may indicate vitreous hemorrhage (especially in diabetic patients), retinal vein occlusion (eye stroke), or acute macular edema. Any sudden change in vision clarity should never be ignored.

For reservations and inquiries: 01002310813

Frequently Asked Questions About Retinal Diseases

Dr. Mahmoud Hassaan compiles answers here to the most common questions on the minds of patients and their families.

Is retinal surgery painful?

Most retinal surgeries are performed under local or general anesthesia, so the patient does not feel any pain during the operation. There may be some discomfort or mild pressure after surgery, which can be controlled with prescribed painkillers.

What is the success rate of retinal detachment surgery?

The success rate depends on several factors, including the size and duration of the detachment and whether the macula was affected. In general, the success rate of retinal detachment surgery exceeds 90% in reattaching the retina anatomically on the first attempt in uncomplicated cases.

When does vision return after vitrectomy?

Vision recovery after vitrectomy varies greatly. If gas is injected, vision will be very blurry until the gas is absorbed (days to weeks). If silicone oil is injected, improvement is faster but the patient may need temporary glasses. Final improvement takes several months.

Can diabetic retinopathy be permanently cured?

Diabetic retinopathy cannot be "cured," but it can be effectively managed to prevent vision loss. Treatment is an ongoing journey that involves controlling blood sugar, blood pressure, and lipids, with regular follow-ups and laser or injection sessions as needed.

What is the difference between gas and silicone oil injection?

Both are used to support the retina after surgery. Gas is spontaneously absorbed by the eye over weeks, while silicone oil removal from the eye requires another surgery after a period. The surgeon chooses the most suitable material based on each case.

Is air travel safe after retinal surgery?

If gas is injected into the eye, air travel after retinal surgery with gas injection is absolutely prohibited until the doctor allows it. Changes in cabin pressure can lead to a dangerous increase in eye pressure. Travel is safe if silicone oil is injected.

How many eye injections will I need?

The number of injections varies depending on the disease and response. The treatment protocol usually starts with three monthly injections, then the condition is evaluated, and the follow-up and injection schedule is determined as needed, and the interval between injections may gradually be extended.

What is the cost of retinal surgeries?

The cost of retinal surgery and vitrectomy in Egypt varies significantly based on the type of surgery (detachment, hemorrhage, hole), the materials used (gas, silicone), and the complexity of the case. The exact cost is determined after a comprehensive examination by Dr. Mahmoud Hassaan.

Should a specific head position be maintained after surgery?

Yes, in many cases, especially after macular hole surgery or certain types of retinal detachment, head positioning after retinal detachment surgery with gas injection (usually face-down) is necessary for several days to ensure the bubble presses on the correct spot and helps the retina heal.

What are the beneficial foods for the retina?

Foods rich in antioxidants such as lutein and zeaxanthin (found in dark leafy greens like spinach and kale), vitamins C and E, zinc, and omega-3 fatty acids (found in fatty fish) help maintain retinal health. Learn about the best vitamins for strengthening the retina.

Does laser weaken vision?

The argon laser used for retinal treatment is a therapeutic laser (cautery), not corrective like LASIK. The patient may notice some small blind spots in peripheral vision after intensive laser sessions, but the primary goal is to preserve central vision and prevent worse complications such as hemorrhage and detachment, so its benefit far outweighs its potential harm.

Does vision return to 20/20 after retinal surgery?

The primary goal of retinal surgery is to save the eye and restore as much visual function as possible, not necessarily to achieve 20/20 vision. The final outcome depends on the extent of damage to the retina before surgery, especially if the macula was affected.

What is Proliferative Vitreoretinopathy (PVR)?

It is the formation of fibrous membranes on the retinal surface after retinal detachment surgery, leading to its traction and surgical failure. It is the most common of the causes of failed retinal detachment surgery and requires more complex surgery to remove it.

Can cataract surgery be performed after retinal surgery?

Yes, and it is very common. Cataract surgery is successfully performed after retinal detachment surgeries, but it requires careful evaluation and expertise to handle an eye that has undergone previous surgery.

What are the most important instructions after retinal surgery?

Instructions include avoiding strenuous physical activity and heavy lifting, not rubbing the eye, adhering to prescribed drops, maintaining the required head position, and attending follow-up appointments. You can refer to our guide on the most important instructions after vitrectomy and recovery tips.

Can retinal detachment occur in the other eye?

Yes, patients who have had detachment in one eye have a higher risk of developing it in the other eye, especially if there are risk factors such as high myopia or peripheral weak areas. Therefore, a comprehensive examination of the healthy eye and prevention of retinal detachment in the second eye by treating any tears or weak areas with laser if necessary, is essential.

What is Retinopathy of Prematurity (ROP)?

It is abnormal blood vessel growth in the retina of infants born prematurely. If not detected and treated early, it can lead to retinal detachment and blindness. Therefore, treatment of Retinopathy of Prematurity (ROP) and careful screening and follow-up are vital.

Do retinal diseases cause blindness?

Yes, if neglected, many retinal diseases such as retinal detachment, advanced diabetic retinopathy, and wet macular degeneration can lead to severe and permanent vision loss. The most important question is, does retinal detachment cause blindness? And the answer is yes, if not treated urgently.

What is a macular hole?

It is a small hole that forms in the center of fine vision (macula), causing a blind spot or distortion in central vision that makes reading or facial recognition difficult. Its treatment is surgical and requires high precision. Learn about macular hole surgery and the success rate of central vision recovery.

Is eye injection painful?

The eye surface is well anesthetized with drops before the injection, so most patients feel slight pressure for moments instead of pain. The fear of injection is worse than the procedure itself. Read more about Intravitreal Injection: Is it painful?.

What is the difference between cataracts and glaucoma?

Cataracts are clouding of the eye's natural lens, and their treatment is surgical with excellent results. Glaucoma, on the other hand, is a disease that affects the optic nerve and is often associated with high eye pressure. It is a chronic disease that requires lifelong treatment to preserve remaining vision. You can learn the difference between cataracts and glaucoma in detail.

How do I choose the right retinal specialist?

The selection depends on the experience and specialized expertise in retinal and vitreous surgeries, academic qualifications, availability of modern equipment in the center where they work, in addition to a good reputation and opinions of previous patients. Read our guide on how to choose the best retinal specialist in Egypt.

For reservations and inquiries: 01002310813

When Should You Visit a Retinal Specialist Immediately?

Retinal health cannot be delayed. Some symptoms, as mentioned, are like a fire alarm that requires an immediate response to save your vision. Never hesitate to contact a retinal specialist or go to an eye emergency room if you notice any of the following signs:

⚠️ Emergency Alert: Go to the doctor immediately if you notice:
• Sudden appearance of a black curtain or shadow moving to obscure part of your visual field.
• Sudden and complete vision loss in one eye (eye stroke).
• Sudden appearance of a large number of floaters accompanied by light flashes.
• Sudden distortion or waviness in the vision of straight lines.

In addition to these emergencies, certain groups of people should undergo regular retinal examinations even if they do not have obvious symptoms:

• Diabetic patients: A comprehensive fundus examination should be performed at least once a year from the time of diagnosis.
• Patients with high myopia: They are at higher risk for retinal tears and detachment.
• Those with a family history of hereditary retinal diseases.
• Individuals over 50 years old: For early detection of age-related macular degeneration.

Always remember, your eyes are your window to the world, and preserving them is an investment in your quality of life. Early diagnosis and timely treatment by a specialized surgeon like Dr. Mahmoud Hassaan at Al-Mashreq Eye Center are the best guarantee for preserving this gift. Do not ignore any abnormal symptom, as your vision is too precious to risk.

If you experience any of these symptoms, or need a routine check-up for peace of mind, our team is ready to provide the best care for your eyes.

To book your appointment with Dr. Mahmoud Hassaan or for inquiries, contact us now: 01002310813

Modern Diagnostic Tests for Retinal and Vitreous Diseases

The diagnosis of retinal and vitreous diseases primarily relies on the accuracy of examinations and the sophistication of the equipment used. At Al-Mashreq Eye Center, Dr. Mahmoud Hassaan invests in the latest diagnostic technologies that provide a detailed view of the delicate retinal layers, aiding in accurate diagnosis and the development of an optimal treatment plan. The eye is no longer a black box, but a clear book thanks to these technologies.

Optical Coherence Tomography (OCT & OCTA)

Optical Coherence Tomography (OCT) is the cornerstone in the diagnosis of macular diseases. The device captures high-resolution cross-sectional images of the retinal layers, much like an "optical biopsy" without any surgical intervention. This examination allows for the visualization of any edema or fluid accumulation, traction on the retinal surface, or macular holes.

OCT-Angiography (OCTA) is a revolutionary development, allowing for precise imaging of retinal blood vessels without the need for injecting fluorescein dye intravenously. It is considered the latest digital examination for diabetic retinopathy without dye, an indispensable tool for monitoring diabetic retinopathy, macular degeneration, and retinal vein occlusions. The prices for OCT and dye angiography scans vary based on the type of examination required.

Ultra-Widefield Fluorescein Angiography (UWF-FFA)

In some cases, we need to evaluate the blood circulation in the entire retina, not just its center. This is where fluorescein angiography (FFA) comes in. Ultra-Widefield imaging technology represents a qualitative leap, as it can image up to 200 degrees of the retina in a single shot, compared to 45-50 degrees with traditional devices. This allows for the detection of any leakage, abnormal blood vessels, or ischemic areas in the peripheral retina, which may be the root cause of the problem. Ultra-Widefield FFA is essential in cases of advanced diabetic retinopathy and inflammatory retinal diseases.

Ocular Ultrasound (B-Scan Ultrasound)

When there is opacity in the transparent media of the eye, such as dense cataracts or severe vitreous hemorrhage, direct examination of the retina becomes impossible. In these cases, we resort to ocular ultrasound (B-Scan). This technique works on the same principle as ultrasound used in other parts of the body, sending ultrasonic waves and receiving their echoes to create a two-dimensional image of the posterior eye components, enabling us to diagnose cases of retinal detachment or the presence of tumors or foreign bodies even when vision is absent.

Optical Biometry

Although this test is primarily associated with calculating the power of the intraocular lens to be implanted in cataract surgery, it is of particular importance for retinal patients. Many of these patients will need cataract surgery at some point, either due to aging or as a side effect of previous retinal surgeries. The computerized eye lens measurement device ensures the most accurate refractive outcome possible after surgery, which is vital for patients already facing vision challenges due to their retinal disease.

Visual Field Test

This test maps the entire range of vision for each eye, including peripheral vision. It is an indispensable test for diagnosing and monitoring glaucoma, but it is also important in retinal diseases that affect peripheral vision, such as retinitis pigmentosa or peripheral retinal detachment. Visual field testing and accurate change analysis help assess the functional damage to the retina.

Electrophysiological Tests (ERG/VEP)

These tests are like an "electrical tracing" of the retina and optic nerve. ERG measures the electrical response of retinal cells (cones and rods) when stimulated by light, which is essential for diagnosing hereditary diseases and retinal degeneration. VEP measures the integrity of the visual pathway from the eye to the brain. ERG and VEP electrophysiology tests of the eye and retina are used in complex cases and unexplained vision loss.

For reservations and inquiries: 01002310813

The Relationship Between Cataracts and Retinal Diseases

Patients often ask about the relationship between cataracts (clouding of the eye's natural lens) and retinal diseases. In reality, the relationship is profound and complex, and understanding it is essential for achieving the best treatment outcomes. The eye is an integrated system, and what affects one part inevitably extends its impact to other parts.

How Retinal Surgeries Affect the Eye's Lens?

One of the most common effects is the impact of retinal surgeries on cataract formation. Vitrectomy surgery, especially when gas or silicone oil is injected, changes the internal eye environment and significantly accelerates cataract formation. For this reason, Dr. Mahmoud Hassaan informs his patients over the age of 50 who undergo vitrectomy that they will likely need cataract surgery within one or two years.

How Cataracts Hinder Retinal Diagnosis and Treatment?

On the other hand, dense cataracts are like a dirty window blocking the view inside a room. Advanced cataracts prevent the retinal surgeon from clearly examining the fundus, which can delay the diagnosis of serious diseases. More importantly, they prevent laser light from reaching the retina, making retinal laser treatment impossible until the opacity is removed. In these cases, performing cataract surgery becomes a necessary therapeutic step to pave the way for retinal treatment.

Challenges of Combined or Sequential Surgery

Cataract treatment in diabetic patients with retinopathy requires special expertise and skill. An eye affected by retinal disease is more sensitive and prone to inflammation and exacerbation of edema after surgery. This requires a surgeon specialized in both problems, such as Dr. Mahmoud Hassaan, to decide the optimal timing for surgery, choose the appropriate type of lens, and establish a strict medication protocol before and after surgery to control inflammation and prevent complications. Sometimes both surgeries (cataract and retina) are performed in the same session, and at other times they are performed sequentially. The decision depends on each patient's individual condition.

For reservations and inquiries: 01002310813

Most Common Patient Complaints and Symptoms: When to Be Concerned?

Retinal diseases are often "silent" in their early stages and cause no pain. Therefore, awareness of symptoms and warning signs is the first line of defense in preserving vision. Here is a guide to the most common complaints patients mention and what they might mean:

1. Eye Floaters

These are points, threads, or cobweb-like shapes that float in the visual field and are more noticeable when looking at a light-colored surface. Most often, these are a natural result of vitreous detachment with age. However, close attention should be paid if they appear suddenly and in large numbers, or if they are accompanied by flashes of light, as this could be a sign of a retinal tear. It is important to know when floaters are normal and when they indicate danger.

2. Flashes of Light

This is seeing short flashes of light, like lightning, especially in the peripheral visual field. This occurs due to vitreous traction on the retina. The appearance of flashes of light, especially if new and persistent, is a very strong warning sign of a potential retinal tear, and requires an urgent fundus examination.

3. A Black Curtain or Shadow Obscuring Vision

⚠️ Emergency Alert: This is the classic symptom of retinal detachment. The patient begins to feel a shadow or black curtain spreading across the visual field, usually from the periphery then advancing towards the center. This is an extreme emergency, as every hour of delay means the death of more retinal cells. Seeing a black curtain obscuring the eye requires immediate attention from an ophthalmologist specializing in retina.

4. Distorted Vision (Metamorphopsia)

The patient sees straight lines (such as door frames or lines of text) as wavy or crooked. This symptom is very characteristic of macular diseases, such as wet macular degeneration, diabetic macular edema, or the presence of an epiretinal membrane. Sudden distorted vision is an accurate indicator of a problem in the core of the retina that requires quick diagnosis and treatment.

5. A Dark or Opaque Spot in the Center of Vision

This is a complaint of a fixed "hole" or spot in the macula that interferes with reading or facial recognition. This is the main sign of a macular hole or an advanced stage of dry macular degeneration. It is a problem that devastatingly affects quality of life and often requires precise surgical intervention.

6. Sudden Blurriness or Haziness of Vision

The causes of sudden blurry or hazy vision can be many, but in the context of retinal diseases, it may indicate vitreous hemorrhage (especially in diabetic patients), retinal vein occlusion (eye stroke), or acute macular edema. Any sudden change in vision clarity should never be ignored.

For reservations and inquiries: 01002310813

Frequently Asked Questions About Retinal Diseases

Dr. Mahmoud Hassaan here gathers answers to the most common questions on the minds of patients and their families.

Is retinal surgery painful?

Most retinal surgeries are performed under local or general anesthesia, so the patient does not feel any pain during the operation. There may be some discomfort or mild pressure after surgery, which can be controlled with prescribed painkillers.

What is the success rate of retinal detachment surgery?

The success rate depends on several factors, including the size and duration of the detachment and whether the macula was affected. In general, the success rate of retinal detachment surgery exceeds 90% in anatomically reattaching the retina on the first attempt in uncomplicated cases.

When does vision return after vitrectomy?

Vision recovery after vitrectomy varies greatly. If gas is injected, vision will be very blurry until the gas is absorbed (days to weeks). If silicone oil is injected, improvement is faster but the patient may need temporary glasses. Final improvement takes several months.

Can diabetic retinopathy be permanently cured?

Diabetic retinopathy cannot be "cured," but it can be effectively managed to prevent vision loss. Treatment is an ongoing journey that involves controlling blood sugar, blood pressure, and lipids, with regular follow-ups and laser or injection sessions as needed.

What is the difference between gas and silicone oil injection?

Both are used to support the retina after surgery. Gas is spontaneously absorbed by the eye over weeks, while silicone oil removal from the eye requires another surgery after a period. The surgeon chooses the most suitable material based on each case.

Is air travel safe after retinal surgery?

If gas is injected into the eye, air travel after retinal surgery with gas injection is absolutely prohibited until the doctor allows it. Changes in cabin pressure can lead to a dangerous increase in eye pressure. Travel is safe if silicone oil is injected.

How many eye injections will I need?

The number of injections varies depending on the disease and response. The treatment protocol usually starts with three monthly injections, then the condition is evaluated, and the follow-up and injection schedule is determined as needed, and the interval between injections may gradually be extended.

What is the cost of retinal surgeries?

The cost of retinal surgery and vitrectomy in Egypt varies significantly based on the type of surgery (detachment, hemorrhage, hole), the materials used (gas, silicone), and the complexity of the case. The exact cost is determined after a comprehensive examination by Dr. Mahmoud Hassaan.

Should a specific head position be maintained after surgery?

Yes, in many cases, especially after macular hole surgery or certain types of retinal detachment, head positioning after retinal detachment surgery with gas injection (usually face-down) is necessary for several days to ensure the bubble presses on the correct spot and helps the retina heal.

What are the beneficial foods for the retina?

Foods rich in antioxidants such as lutein and zeaxanthin (found in dark leafy greens like spinach and kale), vitamins C and E, zinc, and omega-3 fatty acids (found in fatty fish) help maintain retinal health. Learn about the best vitamins for strengthening the retina.

Does laser weaken vision?

The argon laser used for retinal treatment is a therapeutic laser (cautery), not corrective like LASIK. The patient may notice some small blind spots in peripheral vision after intensive laser sessions, but the primary goal is to preserve central vision and prevent worse complications such as hemorrhage and detachment, so its benefit far outweighs its potential harm.

Does vision return to 20/20 after retinal surgery?

The primary goal of retinal surgery is to save the eye and restore as much visual function as possible, not necessarily to achieve 20/20 vision. The final outcome depends on the extent of damage to the retina before surgery, especially if the macula was affected.

What is Proliferative Vitreoretinopathy (PVR)?

It is the formation of fibrous membranes on the retinal surface after retinal detachment surgery, leading to its traction and surgical failure. It is the most common of the causes of failed retinal detachment surgery and requires more complex surgery to remove it.

Can cataract surgery be performed after retinal surgery?

Yes, and it is very common. Cataract surgery is successfully performed after retinal detachment surgeries, but it requires careful evaluation and expertise to handle an eye that has undergone previous surgery.

What are the most important instructions after retinal surgery?

Instructions include avoiding strenuous physical activity and heavy lifting, not rubbing the eye, adhering to prescribed drops, maintaining the required head position, and attending follow-up appointments. You can refer to our guide on the most important instructions after vitrectomy and recovery tips.

Can retinal detachment occur in the other eye?

Yes, patients who have had detachment in one eye have a higher risk of developing it in the other eye, especially if there are risk factors such as high myopia or peripheral weak areas. Therefore, a comprehensive examination of the healthy eye and prevention of retinal detachment in the second eye by treating any tears or weak areas with laser if necessary, is essential.

What is Retinopathy of Prematurity (ROP)?

It is abnormal blood vessel growth in the retina of infants born prematurely. If not detected and treated early, it can lead to retinal detachment and blindness. Therefore, treatment of Retinopathy of Prematurity (ROP) and careful screening and follow-up are vital.

Do retinal diseases cause blindness?

Yes, if neglected, many retinal diseases such as retinal detachment, advanced diabetic retinopathy, and wet macular degeneration can lead to severe and permanent vision loss. The most important question is, does retinal detachment cause blindness? And the answer is yes, if not treated urgently.

What is a macular hole?

It is a small hole that forms in the center of fine vision (macula), causing a blind spot or distortion in central vision that makes reading or facial recognition difficult. Its treatment is surgical and requires high precision. Learn about macular hole surgery and the success rate of central vision recovery.

Is eye injection painful?

The eye surface is well anesthetized with drops before the injection, so most patients feel slight pressure for moments instead of pain. The fear of injection is worse than the procedure itself. Read more about Intravitreal Injection: Is it painful?.

What is the difference between cataracts and glaucoma?

Cataracts are clouding of the eye's natural lens, and their treatment is surgical with excellent results. Glaucoma, on the other hand, is a disease that affects the optic nerve and is often associated with high eye pressure. It is a chronic disease that requires lifelong treatment to preserve remaining vision. You can learn the difference between cataracts and glaucoma in detail.

How do I choose the right retinal specialist?

The selection depends on the experience and specialized expertise in retinal and vitreous surgeries, academic qualifications, availability of modern equipment in the center where they work, in addition to a good reputation and opinions of previous patients. Read our guide on how to choose the best retinal specialist in Egypt.

For reservations and inquiries: 01002310813

When Should You Visit a Retinal Specialist Immediately?

The key to preserving vision in the face of retinal diseases is time. The faster the diagnosis and intervention, the better the chances of saving vision. Never delay visiting a doctor if you notice any symptoms, as hesitation can cost you the gift of sight.

⚠️ Emergency Alert: If you experience any of these symptoms, go to the eye emergency department or contact a retinal specialist immediately. These are not just symptoms; they are emergency signs that if ignored, you may lose vision completely:
• Sudden appearance of a large number of floaters and light flashes together.
• Seeing a shadow or black curtain spreading across your visual field.
• Sudden and painless loss of part or all of your vision.
• Sudden distortion or waviness in the vision of straight lines.

In addition to these emergencies, high-risk groups should undergo regular examinations even in the absence of symptoms. This includes patients with diabetes, high blood pressure, those with high myopia, and those with a family history of hereditary retinal diseases.

At Al-Mashreq Eye Center, Dr. Mahmoud Hassaan and his team provide comprehensive care, starting from accurate diagnosis using the latest equipment, through offering the most advanced treatment options, and culminating in close follow-up to ensure the best possible outcomes. Your eye health is our priority, and we are here to help you every step of the way.

Do not hesitate to contact us. A simple examination today may save your vision tomorrow.

To book your appointment with Dr. Mahmoud Hassaan or for inquiries, click here or call us directly: 01002310813

Frequently Asked Questions

ما هي الشبكية والجسم الزجاجي وما وظيفتهما؟

الشبكية هي طبقة رقيقة من الأنسجة العصبية الحساسة للضوء تبطن الجزء الخلفي من العين، وتعمل على استقبال الضوء وتحويله إلى إشارات كهربائية يرسلها العصب البصري إلى الدماغ لتكوين الصورة. أما الجسم الزجاجي فهو مادة هلامية شفافة تملأ التجويف الأكبر في العين، ووظيفته الأساسية هي الحفاظ على الشكل الكروي للعين وتوفير دعامة خفيفة للشبكية.

ما هي أشهر أعراض أمراض الشبكية التي لا يجب تجاهلها؟

أشهر أعراض أمراض الشبكية تشمل رؤية الذبابة الطائرة (نقاط أو خيوط تسبح في مجال الرؤية)، وميض الضوء (ومضات تشبه البرق)، ظهور ستارة سوداء أو ظل يحجب جزءاً من الرؤية، غشاوة أو ضبابية الرؤية المفاجئة، تشوه الرؤية أو اعوجاج الخطوط المستقيمة، ظهور بقعة عمياء في مركز الرؤية، وتغير في رؤية الألوان أو صعوبة الرؤية الليلية. ظهور أي من هذه الأعراض، خاصة بشكل مفاجئ أو متزايد، يتطلب فحصاً طبياً عاجلاً.

متى تعتبر حالة الشبكية طارئة وتستدعي التوجه الفوري للطبيب؟

تعتبر حالة الشبكية طارئة وتستدعي التوجه الفوري للطبيب إذا ظهرت الأعراض التالية: ظهور مفاجئ لستارة سوداء أو ظل يغطي مجال الرؤية (علامة على انفصال الشبكية)، زيادة مفاجئة وكثيفة في الذباب الطائر مصحوبة بوميض ضوئي (قد تشير لتمزق الشبكية)، فقدان مفاجئ وكامل للرؤية في عين واحدة (قد يكون انسداد شريان الشبكية)، أو ألم شديد واحمرار وغباش عنيف في الرؤية بعد جراحة أو حقن في العين (قد يكون التهاباً حاداً).

ما هو اعتلال الشبكية السكري وما هي مراحله الرئيسية؟

اعتلال الشبكية السكري هو أحد مضاعفات مرض السكري على العين، وينشأ نتيجة لتلف الأوعية الدموية الدقيقة التي تغذي الشبكية بسبب ارتفاع مستوى السكر في الدم. ينقسم إلى مرحلتين رئيسيتين: اعتلال الشبكية السكري غير التكاثري (NPDR) وهي المرحلة المبكرة التي تضعف فيها الأوعية الدموية وتتسرب السوائل، واعتلال الشبكية السكري التكاثري (PDR) وهي المرحلة المتقدمة التي تنمو فيها أوعية دموية جديدة وهشة يمكن أن تسبب نزيفاً أو انفصالاً شبكياً.

ما هي جراحة استئصال الجسم الزجاجي (Vitrectomy) وما هي دواعيها؟

جراحة استئصال الجسم الزجاجي هي عملية ميكروسكوبية يتم فيها إزالة المادة الهلامية (الجسم الزجاجي) التي تملأ تجويف العين الخلفي. تُجرى هذه الجراحة لعلاج حالات معقدة مثل انفصال الشبكية، نزيف الجسم الزجاجي الكثيف، ثقب مركز الإبصار، الغشاء فوق الشبكي، ومضاعفات اعتلال الشبكية السكري المتقدم. تهدف إلى إزالة العوائق أو الشد على الشبكية وإصلاحها.

هل جراحات الشبكية مؤلمة؟

تُجرى معظم جراحات الشبكية تحت تخدير موضعي أو كلي، لذلك لا يشعر المريض بأي ألم أثناء العملية. قد يكون هناك شعور بعدم الراحة أو ضغط خفيف بعد الجراحة، والذي يمكن السيطرة عليه بالمسكنات الموصوفة.

ما هي نسبة نجاح عملية انفصال الشبكية؟

تعتمد نسبة النجاح على عدة عوامل، منها حجم الانفصال ومدته وما إذا كان مركز الإبصار قد تأثر أم لا. بشكل عام، تتجاوز <a href="/ar/articles/هل-عملية-انفصال-الشبكية-ناجحة">نسبة نجاح عملية انفصال الشبكية</a> 90% في إعادة الشبكية إلى مكانها تشريحياً من المحاولة الأولى في الحالات غير المعقدة.

متى يعود النظر بعد عملية الجسم الزجاجي؟

يختلف <a href="/ar/articles/vision-recovery-timeline-after-vitrectomy">استعادة النظر بعد جراحة قص الجسم الزجاجي</a> بشكل كبير. إذا تم حقن غاز، ستكون الرؤية ضبابية جداً حتى يتم امتصاص الغاز (من أيام إلى أسابيع). إذا تم حقن زيت السيليكون، يكون التحسن أسرع ولكن قد يحتاج المريض لنظارة مؤقتة. التحسن النهائي يستغرق عدة أشهر.

هل يمكن علاج اعتلال الشبكية السكري نهائياً؟

لا يمكن "شفاء" اعتلال الشبكية السكري، لكن يمكن السيطرة عليه بفعالية ومنع فقدان النظر. العلاج هو رحلة مستمرة تتضمن ضبط سكر الدم والضغط والدهون، مع المتابعة الدورية وجلسات الليزر أو الحقن عند الحاجة.

ما الفرق بين حقن الغاز وزيت السيليكون؟

كلاهما يستخدم لدعم الشبكية بعد الجراحة. الغاز يمتص تلقائياً من العين خلال أسابيع، بينما يتطلب <a href="/ar/articles/silicone-oil-removal">عملية إزالة زيت السيليكون من العين</a> جراحة أخرى بعد فترة. يختار الجراح المادة الأنسب حسب كل حالة.

هل السفر بالطائرة آمن بعد جراحة الشبكية؟

إذا تم حقن غاز في العين، فإن <a href="/ar/articles/flying-after-retinal-surgery-gas-warning">السفر بالطائرة بعد عملية الشبكية وحقن الغاز</a> ممنوع تماماً حتى يسمح الطبيب بذلك. التغير في ضغط الكابينة قد يؤدي إلى ارتفاع خطير في ضغط العين. السفر آمن في حالة حقن زيت السيليكون.

كم عدد حقن العين التي سأحتاجها؟

يختلف عدد الحقن حسب المرض والاستجابة. عادة ما يبدأ بروتوكول العلاج بثلاث حقن شهرية، ثم يتم تقييم الحالة وتحديد جدول المتابعة والحقن حسب الحاجة، وقد تمتد الفترة بين الحقن تدريجياً.

ما هي تكلفة جراحات الشبكية؟

تختلف <a href="/ar/articles/تكلفة-عملية-الجسم-الزجاجي">تكلفة عملية الشبكية واستئصال الجسم الزجاجي في مصر</a> بشكل كبير بناءً على نوع الجراحة (انفصال، نزيف، ثقب)، والمواد المستخدمة (غاز، سيليكون)، ومدى تعقيد الحالة. يتم تحديد التكلفة الدقيقة بعد الفحص الشامل بواسطة د. محمود حسان.

هل يجب الالتزام بوضعية معينة للرأس بعد الجراحة؟

نعم، في كثير من الحالات، خاصة بعد جراحة ثقب مركز الإبصار أو بعض أنواع الانفصال الشبكي، يكون <a href="/ar/articles/head-position-after-retinal-surgery-gas">وضع الرأس بعد عملية انفصال الشبكية وحقن الغاز</a> (عادةً النظر للأسفل) ضرورياً لعدة أيام لضمان ضغط الفقاعة على المكان الصحيح ومساعدة الشبكية على الالتئام.

ما هي الأغذية المفيدة للشبكية؟

الأطعمة الغنية بمضادات الأكسدة مثل اللوتين والزياكسانثين (الموجودة في الخضروات الورقية الداكنة مثل السبانخ واللفت)، وفيتامينات C و E، والزنك، وأحماض أوميغا 3 الدهنية (الموجودة في الأسماك الدهنية) تساعد في الحفاظ على صحة الشبكية. تعرف على <a href="/ar/articles/vitamins-for-retina-health">أفضل فيتامينات لتقوية شبكية العين</a>.

هل الليزر يضعف النظر؟

ليزر الأرجون المستخدم لعلاج الشبكية هو ليزر علاجي (كي)، وليس تصحيحياً مثل الليزك. قد يلاحظ المريض بعض البقع العمياء الصغيرة في الرؤية المحيطية بعد جلسات الليزر المكثفة، لكن الهدف الأساسي هو الحفاظ على الرؤية المركزية ومنع المضاعفات الأسوأ مثل النزيف والانفصال، لذا فإن فائدته تفوق ضرره المحتمل بكثير.

هل يعود النظر 6/6 بعد جراحة الشبكية؟

الهدف الأساسي لجراحة الشبكية هو إنقاذ العين واستعادة أكبر قدر ممكن من الوظيفة البصرية، وليس بالضرورة الوصول إلى نظر 6/6. تعتمد النتيجة النهائية على مدى الضرر الذي لحق بالشبكية قبل الجراحة، خاصة إذا كان مركز الإبصار متأثراً.

ما هو التليف الشبكي (PVR)؟

هو تكوّن أغشية تليفية على سطح الشبكية بعد جراحة انفصال الشبكية، مما يؤدي إلى شدها وفشل العملية. يعتبر <a href="/ar/articles/failed-retinal-detachment-surgery-causes-pvr">أسباب فشل عملية انفصال الشبكية</a> الأكثر شيوعاً، ويتطلب جراحة أكثر تعقيداً لإزالته.

هل يمكن إجراء عملية مياه بيضاء بعد جراحة الشبكية؟

نعم، وهو أمر شائع جداً. تُجرى <a href="/ar/articles/cataract-surgery-after-retinal-detachment-silicone">عملية المياه البيضاء بعد جراحات انفصال الشبكية</a> بنجاح، ولكنها تتطلب تقييماً دقيقاً وخبرة للتعامل مع العين التي خضعت لجراحة سابقة.

ما هي أهم التعليمات بعد عملية الشبكية؟

تشمل التعليمات تجنب المجهود البدني ورفع الأثقال، عدم فرك العين، الالتزام بالقطرات الموصوفة، الحفاظ على وضعية الرأس المطلوبة، وحضور مواعيد المتابعة. يمكنك الاطلاع على دليل <a href="/ar/articles/post-vitrectomy-instructions">أهم التعليمات بعد عملية استئصال الجسم الزجاجي ونصائح التعافي</a>.

هل يمكن أن يحدث انفصال شبكي في العين الأخرى؟

نعم، وجود انفصال في عين يزيد من خطر حدوثه في العين الأخرى. لذلك، من الضروري إجراء فحص شامل للعين السليمة والقيام بـ <a href="/ar/articles/preventing-retinal-detachment-second-eye-prophylaxis">الوقاية من انفصال الشبكية في العين الثانية</a> عن طريق علاج أي تمزقات أو مناطق ضعف بالليزر إذا لزم الأمر.

ما هو اعتلال الشبكية عند الأطفال المبتسرين (ROP)؟

هو نمو غير طبيعي للأوعية الدموية في شبكية الأطفال الذين يولدون قبل الأوان. إذا لم يتم اكتشافه وعلاجه مبكراً، يمكن أن يؤدي إلى انفصال الشبكية والعمى. لذا، فإن <a href="/ar/articles/retinopathy-of-prematurity-rop-screening-followup">علاج اعتلال الشبكية عند الأطفال المبتسرين (ROP) والفحص والمتابعة الدقيقة</a> أمر حيوي.

هل تسبب أمراض الشبكية العمى؟

نعم، إذا أُهملت، فإن العديد من أمراض الشبكية مثل الانفصال الشبكي واعتلال الشبكية السكري المتقدم والضمور البقعي الرطب يمكن أن تؤدي إلى فقدان دائم وشديد للنظر. السؤال الأهم هو <a href="/ar/articles/retinal-detachment-blindness">هل الانفصال الشبكي يسبب العمى؟</a> والإجابة هي نعم إذا لم يتم علاجه بشكل عاجل.

ما هو ثقب مركز الإبصار؟

هو ثقب صغير يتكون في مركز الرؤية الدقيقة (الماكولا)، مما يسبب بقعة عمياء أو تشوهاً في الرؤية المركزية يجعل القراءة أو تمييز الوجوه صعباً. علاجه جراحي ويتطلب دقة عالية. تعرف على <a href="/ar/articles/macular-hole-surgery">عملية ثقب مركز الإبصار ونسبة نجاح استرداد الرؤية المركزية</a>.

هل حقن العين مؤلم؟

يتم تخدير سطح العين جيداً بقطرات قبل الحقن، لذلك يشعر معظم المرضى بضغط خفيف للحظات بدلاً من الألم. الخوف من الحقن يكون أسوأ من الإجراء نفسه. اقرأ المزيد عن <a href="/ar/articles/is-intravitreal-eye-injection-painful-facts">الحقن الجلدي أو الموضعي للعين (Intravitreal Injection): هل هو مؤلم؟</a>.

ما هو الفرق بين المياه البيضاء والمياه الزرقاء؟

المياه البيضاء هي عتامة عدسة العين، وعلاجها جراحي ونتائجه ممتازة. أما المياه الزرقاء (الجلوكوما) فهي مرض يصيب العصب البصري ويرتبط غالباً بارتفاع ضغط العين، وهو مرض مزمن يتطلب علاجاً مدى الحياة للحفاظ على ما تبقى من النظر. يمكنك معرفة <a href="/ar/articles/الفرق-بين-المياه-البيضاء-والزرقاء-في-العين">الفرق بين المياه البيضاء والزرقاء في العين</a> بالتفصيل.

كيف أختار طبيب الشبكية المناسب؟

الاختيار يعتمد على الخبرة والتخصص الدقيق في جراحات الشبكية، والشهادات العلمية، وتوفر الأجهزة الحديثة في المركز الذي يعمل به، بالإضافة إلى السمعة الجيدة وآراء المرضى السابقين. اقرأ دليلنا حول <a href="/ar/articles/افضل-دكتور-شبكية-في-مصر">كيفية اختيار افضل دكتور شبكية في مصر؟</a>.

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