Central Retinal Vein Occlusion (CRVO)

Overview

Central retinal vein occlusion (CRVO) is a blockage of the main vein that drains blood from the retina, the light-sensing layer at the back of the eye. When this vein is obstructed — usually by a clot — blood and fluid back up in the retina, causing widespread haemorrhages and swelling, particularly at the macula (the centre of vision). The result is typically sudden, painless blurring or loss of vision in one eye.

CRVO is not treated by surgery to reopen the vein; instead, care focuses on reducing macular swelling with injections, preventing complications such as abnormal new blood vessels, and managing the underlying risk factors like high blood pressure and diabetes. A related, usually milder form, branch retinal vein occlusion, affects only part of the retina.

CRVO outcomes vary widely with the severity and type of occlusion, and vision may not fully recover. This page is an educational overview only — it is not medical advice, and no outcome can be guaranteed.

Who May Need This

People with CRVO are usually older adults, often with cardiovascular risk factors such as high blood pressure, diabetes, high cholesterol, or glaucoma. It can also occur in younger people, sometimes linked to clotting disorders or inflammation. The typical presentation is a sudden, painless drop in vision in one eye.

Anyone with these symptoms needs prompt assessment by an eye specialist. A retinal specialist confirms the diagnosis, determines the type and severity, checks for complications, and — together with the patient’s physician — helps address the underlying medical conditions.

When It May Be Recommended

Treatment is recommended when CRVO causes macular swelling that reduces vision, since injections can lessen the swelling and improve sight. It is also recommended when signs of an ischaemic (poor-blood-flow) occlusion or abnormal new vessels appear, to prevent the serious complication of neovascular glaucoma.

Early treatment of macular swelling tends to give better visual results, so prompt referral matters. The specific plan — and how urgently it is needed — depends on the type of CRVO, the degree of swelling, and the presence of complications, and is decided after evaluation.

Diagnosis and Evaluation

Diagnosis is made on a dilated retinal examination showing the characteristic haemorrhages and swelling, supported by optical coherence tomography (OCT) to measure macular swelling and fluorescein angiography to assess blood flow and distinguish ischaemic from non-ischaemic CRVO. Eye pressure is checked, and the iris is examined for new vessels.

Because CRVO reflects the health of the blood vessels, evaluation also includes checking blood pressure, blood sugar, and cholesterol, and, in younger patients, tests for clotting or inflammatory disorders. This medical work-up, often with the patient’s physician, is a key part of care.

Treatment Options

The main treatment for vision loss from macular swelling is intravitreal injections of anti-VEGF medication, given as a series and adjusted according to response; a steroid injection or implant is an alternative in some cases. Laser photocoagulation is used mainly to treat or prevent abnormal new vessels in ischaemic CRVO, not to restore central vision.

If neovascular glaucoma develops, urgent treatment with laser, injections, and pressure-lowering measures is needed. Equally important is managing the underlying conditions — blood pressure, diabetes, cholesterol — to protect both eyes and general health. The plan is individualised to the type and severity of the occlusion.

How It Is Performed

An intravitreal injection is a brief outpatient procedure. The eye is numbed with drops and cleaned with antiseptic, a small clip holds the lids open, and the medication is injected into the eye through a very fine needle in the white of the eye. It takes only minutes, and most people feel pressure rather than pain.

Laser treatment, when needed for new vessels, is also an outpatient procedure: after numbing and a special contact lens, the surgeon applies laser spots to the peripheral retina to reduce the drive for abnormal vessels. Injections are typically repeated over months, with the schedule guided by OCT scans and the eye’s response.

Preparation

Preparation is straightforward for injections: tell your specialist about medications and any eye infection, and expect the eye to be a little red and gritty afterwards. Because CRVO reflects vascular health, arrange the recommended medical checks and treatment of blood pressure, diabetes, and cholesterol with your physician.

If you are travelling abroad, be aware that CRVO usually needs ongoing, repeated treatment and monitoring, so plan how this will continue at home. Bring your eye records and OCT scans, and arrange follow-up with a retinal specialist near you.

Benefits and Expected Goals

The goals of treatment are to reduce macular swelling and improve or stabilise vision, and to prevent the sight-threatening complication of neovascular glaucoma. Many appropriately treated patients gain some improvement in vision as swelling settles, and the risk of severe complications can be lowered.

Benefits vary greatly with the type and severity of the occlusion. Ischaemic CRVO generally has a poorer visual outlook, and treatment cannot reverse damage already done to the retina. Continued injections and monitoring are often needed to maintain any gains. Your specialist can explain the realistic outlook.

Risks and Possible Complications

CRVO itself and its treatments carry risks that should be understood.

• Persistent or recurrent macular swelling despite treatment
• Neovascular glaucoma — abnormal new vessels raising eye pressure painfully
• Permanent vision loss, especially in ischaemic CRVO
• Injection-related risks: eye infection (rare but serious), raised pressure, bleeding, or, rarely, retinal detachment
• Steroid-related cataract or raised pressure
• The need for repeated, long-term treatment

Your specialist will explain the risks relevant to your CRVO type and treatment. Seek urgent care for a red, painful eye with worsening vision, which may indicate raised pressure.

Recovery, Follow-up & Aftercare

After an injection the eye may be red and gritty for a day or two; you may be given antibiotic drops and told to watch for warning signs of infection such as increasing pain, redness, or worsening vision. Most people resume normal activities the same or next day.

CRVO care is ongoing: injections are usually repeated over months, guided by OCT scans, and the eye is monitored for new vessels and pressure changes for a prolonged period. Continue treating your blood pressure, diabetes, and cholesterol. Arrange regular follow-up with a retinal specialist at home, as this monitoring and treatment continue long-term.

Medical Tourism Planning

CRVO needs continuous, repeated treatment, which makes it less suited to one-off travel than a single operation. If arranging care abroad, choose a JCI- or ISO-accredited hospital with a retinal service and OCT and angiography facilities, and plan carefully how injections and monitoring will continue at home.

Confirm which medications are available and their costs, and how neovascular glaucoma would be handled. Bring your records and scans, arrange ongoing retinal and medical care near you, request a written treatment plan and cost estimate, and consider medical travel insurance.

Estimated Cost Factors

The cost of CRVO care depends on the country and hospital, the specialist’s fees, the type and number of injections (anti-VEGF medicines and steroid implants differ in price and frequency), imaging such as OCT and angiography, any laser treatment, and the long-term, repeated nature of monitoring. Because treatment is ongoing, cumulative cost matters more than a single visit.

Many destinations offer retinal injections at a fraction of typical US prices, but figures vary and online prices are only estimates. Always request a personalized written quote that reflects the likely course of treatment, not just one injection, before deciding.

Choosing a Hospital or Specialist

Look for an accredited hospital with a medical retina service, a retinal specialist experienced in vein occlusions, and OCT and angiography facilities. Ask which medications they use, how they monitor and adjust treatment, and how they detect and manage neovascular glaucoma.

Because CRVO is a long-term condition, confirm how care will be coordinated with your physician and continued near your home. Transparent written pricing that accounts for repeated treatment and a clear discussion of realistic outcomes are signs of a quality programme.

Alternatives

There is no procedure that reopens the blocked vein, so alternatives are really different treatment strategies. These include anti-VEGF injections versus a steroid implant, the timing and extent of laser for new vessels, and — for mild non-ischaemic cases with good vision — observation with monitoring while controlling risk factors.

Managing the underlying medical conditions is an essential part of every plan. Each treatment has different benefits, risks, and monitoring needs. Discuss the options with a retinal specialist so the plan fits your CRVO type and overall health.

Questions to Ask Your Doctor

• Is my CRVO the ischaemic or non-ischaemic type, and what does that mean for my vision?
• Which treatment do you recommend, and how many injections am I likely to need?
• How will you monitor for and prevent neovascular glaucoma?
• What underlying conditions do I need to manage, and with whom?
• What are the specific risks of the injections in my case?
• How will my treatment and monitoring continue near my home?
• What does the written cost estimate cover over the likely course of treatment?