Retinal Vein Occlusion Treatment (CRVO & BRVO)
What is Retinal Vein Occlusion?
A retinal vein occlusion (RVO) occurs when a vein carrying blood away from the retina becomes blocked. This can cause bleeding and fluid leakage in the retina, leading to swelling and blurred or distorted vision. Retinal vein occlusion is more common in people with high blood pressure, diabetes, high cholesterol and glaucoma, although it can also occur without these risk factors.
There are two main types of retinal vein occlusion: central retinal vein occlusion (CRVO) and branch retinal vein occlusion (BRVO). CRVO affects the main retinal vein and can cause more widespread retinal changes and a significant reduction in vision. Macular edema, or swelling of the central retina, is a common cause of vision loss. CRVO treatment usually involves anti-VEGF injections, with laser or other treatments needed in selected cases.
BRVO occurs when one of the smaller retinal veins becomes blocked. It usually affects a more localized area, but vision can be affected when the macula is involved. BRVO treatment commonly involves anti-VEGF injections, while laser treatment may be considered in appropriate cases.
OCT helps detect and monitor macular swelling, while fundus fluorescein angiography (FFA) can assess retinal blood flow and areas of ischemia or leakage.
At ARC Eye & Retina Centre in Gurgaon, our retina specialists provide comprehensive Retinal Vein Occlusion Treatment, including advanced imaging, injections, laser treatment and regular monitoring.
Signs & Symptoms of Retinal Vein Occlusion
The symptoms of retinal vein occlusion can vary depending on where the blockage occurs and whether the macula is affected. In many patients, the condition develops suddenly and usually affects one eye.
The most common symptom is blurred or reduced vision, which may range from mild blurring to a significant drop in vision. Some people notice distorted vision, with straight lines appearing bent or objects looking different in shape. If swelling affects the macula, reading, recognizing faces and seeing fine details can become difficult.
Other possible symptoms include dark spots, shadows or areas of missing vision. These can occur because of retinal bleeding, swelling or reduced blood supply. Occasionally, retinal vein occlusion may cause very few symptoms and is discovered during a routine eye examination.
Retinal vein occlusion is usually painless and does not typically cause redness. Therefore, a sudden, painless change in vision should not be ignored, even if the vision loss appears mild.
Symptoms can change over time as retinal swelling develops or recurs. In some patients, reduced blood flow can also lead to abnormal blood vessel growth and other complications.
If you experience sudden blurring, distortion, dark spots or an unexplained change in vision, a retinal examination should be arranged promptly.
At ARC Eye & Retina Centre, Gurgaon, our retina specialists use detailed retinal examination and imaging to identify the cause and plan appropriate Vein Occlusion Treatment.
Risk Factors for Retinal vein occlusion
Retinal vein occlusion can sometimes occur without an obvious cause, but certain medical conditions and lifestyle factors can increase the risk. These risk factors are broadly similar for CRVO and BRVO, although their importance may vary between individuals.
| Risk Factor | CRVO | BRVO |
|---|---|---|
| High blood pressure | Strongly associated | Strongly associated |
| Diabetes | Increased risk | Increased risk |
| High cholesterol | Associated | Associated |
| Glaucoma / raised eye pressure | Important risk factor | May increase risk |
| Increasing age | Increased risk | Increased risk |
| Smoking | May increase risk | May increase risk |
| Obesity / sedentary lifestyle | May contribute | May contribute |
| Blood-clotting disorders | May be relevant | May be relevant |
High blood pressure is one of the most important risk factors for retinal vein occlusion. Diabetes and high cholesterol can also affect the small blood vessels over time. Glaucoma and raised eye pressure are particularly important when assessing the risk of CRVO.
In younger patients, or when vein occlusion occurs without the usual risk factors, additional investigations may sometimes be recommended to look for vascular or blood-clotting conditions.
Managing blood pressure, blood sugar and cholesterol, avoiding smoking, maintaining a healthy weight and having regular eye examinations can help reduce vascular risk.
At ARC Eye & Retina Centre in Gurgaon, we assess both the retinal condition and relevant systemic risk factors when planning Retinal Vein Occlusion Treatment and long-term follow-up.
Retinal Vein Occlusion Diagnosis
Diagnosing retinal vein occlusion starts with a detailed eye examination and careful assessment of the retina. Since some patients may have only mild symptoms, particularly in the early stages, a thorough retinal evaluation is important.
A dilated retinal examination allows the retina specialist to look for retinal bleeding, swelling and changes in the blood vessels. It also helps determine whether the patient has central retinal vein occlusion (CRVO) or branch retinal vein occlusion (BRVO).
OCT (Optical Coherence Tomography) is an important part of retinal vein occlusion diagnosis. It provides detailed images of the retinal layers and can detect macular edema, one of the main causes of reduced vision. OCT is also useful during follow-up to monitor swelling and response to treatment.
In selected patients, fundus fluorescein angiography (FFA) may be recommended. Angiography helps assess blood flow through the retinal vessels and can identify areas of ischemia, leakage or abnormal blood vessel growth. This information can be useful when deciding on treatment and follow-up.
Depending on the patient's age, medical history and examination findings, the doctor may also recommend checking blood pressure, blood sugar and cholesterol, or investigating other vascular or blood-clotting conditions.
At ARC Eye & Retina Centre, Gurgaon, we combine detailed retinal examination with advanced imaging to understand the severity of vein occlusion and plan individualized Retinal Vein Occlusion Treatment.
A sudden change in vision should always be assessed promptly by a retina specialist.
Advanced Treatment Options for Retinal Vein Occlusion
The treatment of retinal vein occlusion depends on the type of blockage, the amount of retinal and macular swelling, and whether there are areas of reduced blood supply. The main goals are to control swelling, protect vision and prevent complications.
Anti-VEGF injections are the most commonly used treatment when retinal vein occlusion causes macular edema. They reduce leakage and swelling within the retina and can help improve or stabilize vision. Depending on the response, several injections may be required.
For CRVO (Central Retinal Vein Occlusion), anti-VEGF treatment is commonly recommended when macular edema affects vision. Selected patients may also benefit from corticosteroid treatment. Patients with significant retinal ischemia require close monitoring because of the risk of abnormal blood vessel growth.
For BRVO (Branch Retinal Vein Occlusion), anti-VEGF injections are commonly used when the macula is affected. Laser treatment may be useful in selected cases, particularly when there is persistent retinal leakage or ischemia.
OCT is used to monitor macular swelling and treatment response. FFA or retinal angiography may be performed when a more detailed assessment of retinal circulation is needed.
At ARC Eye & Retina Centre in Gurgaon, our retina specialists provide individualized Retinal Vein Occlusion Treatment for CRVO and BRVO, including advanced retinal imaging, angiography, anti-VEGF or steroid injections, laser treatment and regular follow-up.
Retinal Vein Occlusion: Risk Mitigation and Preventive Strategies
Retinal vein occlusion cannot always be prevented, but controlling the conditions that affect blood vessels can help reduce the risk. This is particularly important for patients who have already had CRVO or BRVO, as vascular problems can sometimes affect the other eye as well.
Keeping blood pressure, blood sugar and cholesterol under control is an important part of reducing vascular risk. People with diabetes should have regular retinal examinations even when their vision appears normal.
A healthy weight, regular physical activity and a balanced diet can support overall cardiovascular and retinal health. Smoking should be avoided, as it can adversely affect blood vessels. Patients with glaucoma or raised eye pressure should also have regular eye checks and appropriate treatment.
In younger patients, or when retinal vein occlusion occurs without the usual risk factors, additional investigations may sometimes be advised to look for blood-clotting or other vascular conditions.
If you have previously had a retinal vein occlusion, regular retinal follow-up remains important even when your vision feels stable. OCT can detect recurrent macular swelling, while retinal examination and angiography, when required, can identify other changes early.
At ARC Eye & Retina Centre, Gurgaon, we take a comprehensive approach to Retinal Vein Occlusion Treatment, combining retinal monitoring with assessment of relevant eye and systemic risk factors. Timely treatment and regular follow-up can help protect vision and reduce the risk of complications.
FAQ
Central Retinal Vein Occlusion (CRVO)—often referred to as an "eye stroke"—occurs when the main vein that drains blood away from the retina becomes blocked by a blood clot (thrombus). This blockage causes blood and fluid to back up, leading to retinal hemorrhages, swelling of the macula (macular edema), and sudden vision impairment.
Retinal vein occlusions are categorized by where the blockage occurs:
- Central Retinal Vein Occlusion (CRVO): The main trunk of the central retinal vein is blocked, impacting the entire retina and typically causing more severe, widespread visual loss.
- Branch Retinal Vein Occlusion (BRVO): Only a smaller branch of the retinal vein system is obstructed, affecting just one localized quadrant or sector of the retina.
The hallmark signs of RVO include:
- Sudden, painless blurring or loss of vision in one eye (frequently noticed upon waking)
- Distorted central vision (metamorphopsia), where straight lines appear wavy
- Dark spots, blind spots (scotomas), or a gray shadow covering parts of your field of vision
- Sensation of a heavy or dim haze over the affected eye
CRVO develops when blood flow slows or a clot forms within the central retinal vein. Major risk factors include:
- Systemic Health Conditions: Uncontrolled hypertension (high blood pressure), diabetes mellitus, and high cholesterol.
- Ocular Factors: High intraocular pressure and open-angle glaucoma.
- Hematologic Factors: Blood clotting disorders (hypercoagulability), abnormal blood thickness, or vasculitis (particularly in patients under 50).
- Lifestyle & Demographics: Age over 50, cardiovascular disease, and smoking.
At ARC Eye Centre, our retina specialists perform comprehensive multimodal imaging:
- Dilated Fundus Examination: Direct visualization of characteristic "blood and thunder" intraretinal hemorrhages.
- High-Resolution Optical Coherence Tomography (HD-OCT): Cross-sectional scans to quantify macular edema and monitor treatment response.
- Fundus Fluorescein Angiography (FFA): Intravenous dye test to evaluate blood flow, identify areas of retinal ischemia (lack of blood supply), and detect leaking vessels.
- OCT-Angiography (OCT-A): Non-invasive evaluation of retinal microvasculature without dye injection.
Treatment focuses on resolving swelling (macular edema) and preventing secondary complications:
- Anti-VEGF Injections: Medications (such as Ranibizumab, Aflibercept, or Faricimab) injected into the eye to block fluid leakage and reduce macular swelling.
- Intravitreal Corticosteroid Implants: Sustained-release dexamethasone implants (e.g., Ozurdex) to suppress severe inflammation and edema.
- Retinal Laser Therapy: Pan-Retinal Photocoagulation (PRP) or sector laser to treat non-perfused ischemic areas and prevent abnormal vessel growth.
- Management of Systemic Risk Factors: Collaborating with physicians to control blood pressure, blood glucose, and lipid profiles.
When a vein is blocked, retinal tissue becomes starved of oxygen (ischemia), releasing excessive Vascular Endothelial Growth Factor (VEGF). High VEGF levels cause blood vessels to become abnormally leaky, creating macular swelling. Anti-VEGF injections neutralize this protein, drying up the swelling, stabilizing the retina, and helping restore vision.
No. Before an intravitreal injection, the eye is thoroughly numbed with topical anesthetic drops. The procedure is performed in a sterile treatment room and takes only a few seconds. Few patients report feeling a slight pressure but no pain.
Non-Ischemic CRVO: The milder and more common form, characterized by partial venous blockage, preserved capillary blood supply, and better visual recovery potential.
Ischemic CRVO: A severe form where extensive capillary beds are closed off. It carries a higher risk of profound vision loss and secondary complications like Neovascular Glaucoma, requiring aggressive monitoring and prompt laser/anti-VEGF therapy.
Neovascular Glaucoma is a severe complication that can occur months after an ischemic CRVO (often called "90-day glaucoma"). Severe retinal oxygen deprivation triggers abnormal, fragile new blood vessels to grow on the iris and the eye’s drainage angle, blocking fluid outflow and spiking eye pressure. Regular follow-ups, timely laser photocoagulation (PRP), and anti-VEGF injections effectively prevent this complication.