Retinal Vein Occlusion (Eye Stroke)
Understanding Retinal Vein Occlusion (Eye Stroke)
Retinal vein occlusion occurs when one of the veins carrying blood away from your retina becomes blocked. The retina is the light-sensitive tissue at the back of your eye that helps you see clearly. When a vein is blocked, blood and fluid can leak into the retina, causing swelling and vision problems.
This condition is sometimes called an 'eye stroke' because it shares similarities with strokes that affect the brain. Like a stroke, it can happen suddenly and needs quick attention from an eye care professional. It is important to know that some people use the term 'eye stroke' to refer to retinal artery occlusion, which is a different and more urgent condition. Retinal artery occlusion happens when an artery is blocked and often requires immediate emergency room evaluation. Both retinal vein occlusion and retinal artery occlusion need urgent eye assessment, but they are treated differently.
There are two main types of retinal vein occlusion. Central retinal vein occlusion (CRVO) affects the main vein that drains blood from your entire retina. Branch retinal vein occlusion (BRVO) blocks only a smaller branch vein.
BRVO is more common and usually affects a smaller area of your vision. CRVO can cause more severe vision loss because it impacts the whole retina. We determine which type you have during your examination to plan the best treatment.
Within CRVO, there is an important distinction between ischemic and non-ischemic types. Ischemic CRVO means that a large part of the retina is not getting enough blood and oxygen. This type often causes worse initial vision and carries a higher risk of developing abnormal new blood vessels in the first four to six months. Non-ischemic CRVO has better blood flow to the retina and a better outlook, though it can sometimes turn into ischemic CRVO over time. Ischemic CRVO requires closer follow-up to watch for complications.
When a retinal vein is blocked, blood cannot drain properly from your retina. This causes pressure to build up in the tiny blood vessels. Fluid and blood then leak into the surrounding retinal tissue, leading to swelling called macular edema.
- Blood leaks into the retina and blocks light from reaching photoreceptor cells
- Swelling in the macula (the central part of the retina) blurs your detailed vision
- The retina may not receive enough oxygen, which can damage sensitive nerve cells
- Abnormal new blood vessels may grow and cause additional complications
Without treatment, retinal vein occlusion can cause lasting vision problems. The amount of permanent vision loss depends on how severe the blockage is, how quickly you receive treatment, and whether complications develop.
Early treatment can help reduce swelling and prevent further damage to your retina. Many patients see improvement in their vision with proper care, although some may experience ongoing visual changes. We monitor your condition closely to give you the best chance of preserving your sight.
Signs and Symptoms of Retinal Vein Occlusion
The most common sign of retinal vein occlusion is a sudden change in vision that affects only one eye. You may notice this when you wake up in the morning or at any time during the day. The vision change can range from mild blurriness to severe vision loss.
Because retinal vein occlusion typically happens in only one eye, you might not notice the problem right away if your other eye is seeing well. Cover each eye separately to check if one eye is seeing differently than the other.
Blurry vision is one of the main symptoms our patients report. Objects may look fuzzy or out of focus, and you might have trouble reading or recognizing faces. The blurriness usually starts suddenly rather than developing slowly over time.
- Straight lines may appear wavy or bent
- Colors might seem less bright or washed out
- You may need brighter light to see clearly
- Words on a page might look distorted or missing
Some people with retinal vein occlusion see dark spots, floaters, or shadows in their vision. These may look like small specks, cobwebs, or clouds drifting across your field of view. They are caused by blood or other material floating in the vitreous gel inside your eye.
While floaters are common and often harmless, a sudden increase in floaters can be a warning sign. If you notice many new floaters appearing at once, especially with flashes of light, contact us right away.
Depending on which vein is blocked, you may lose part of your side vision or central vision. Branch retinal vein occlusion often creates a blind spot in one section of your visual field. Central retinal vein occlusion may affect your ability to see fine details in the center of your vision.
You might notice that part of your view is missing or blacked out. This can make activities like reading, driving, or watching television more difficult.
Any sudden vision loss should be treated as urgent. Different eye and brain conditions can cause sudden vision changes, and some require immediate emergency care. The sooner you receive the right evaluation and treatment, the better your chances of recovering vision.
- If you have sudden vision loss along with face droop, arm weakness, or trouble speaking, call 911 immediately. These may be signs of a stroke affecting your brain.
- If you develop a sudden, painless loss of central vision like a dense dark gray spot with very poor reading ability, go to the emergency room or call our office for same day urgent care. This pattern may indicate retinal artery occlusion, which is a true eye emergency.
- If you notice a curtain or shadow spreading across your vision, you may have a retinal detachment. Seek urgent eye care the same day.
- Sudden loss of vision in one eye from retinal vein occlusion also needs prompt attention, typically within a day or two for best results.
- New floaters combined with flashes of light or severe eye pain along with vision changes also require urgent evaluation.
If you cannot reach our office quickly and you have any of these urgent symptoms, go to the emergency room for evaluation and help contacting an eye specialist.
Risk Factors and Causes of Retinal Vein Occlusion
High blood pressure is one of the most common risk factors for retinal vein occlusion. When your blood pressure is too high, it can damage the walls of your blood vessels and make them stiffer. This damage can lead to clots or blockages in the delicate veins of your retina.
Managing your blood pressure through medication, diet, and lifestyle changes can help reduce your risk. We may recommend working with your primary care doctor to keep your blood pressure in a healthy range and protect your eye health.
Diabetes affects blood vessels throughout your body, including the small vessels in your eyes. High blood sugar levels can weaken vein walls and increase the risk of blockages. People with diabetes are more likely to develop retinal vein occlusion than those without diabetes.
- Blood sugar fluctuations can damage the lining of blood vessels
- Diabetes increases the risk of blood clots forming in veins
- Poor blood sugar control accelerates blood vessel disease
- Regular diabetic eye exams help catch problems early
Glaucoma causes increased pressure inside your eye, which can compress the retinal veins and restrict blood flow. The higher pressure makes it harder for blood to drain from the retina. If you have glaucoma, controlling your eye pressure is important for preventing retinal vein occlusion.
We check your eye pressure during routine exams. If you have both glaucoma and retinal vein occlusion, we create a treatment plan that addresses both conditions to protect your vision.
Retinal vein occlusion becomes more common as you get older, especially after age 50. As we age, blood vessels become less flexible and more prone to blockages. The walls of arteries can harden and press on nearby veins, restricting blood flow.
Certain blood clotting disorders also increase your risk. These conditions make your blood more likely to form clots. If you have a personal or family history of unusual blood clots, let our eye doctor know so we can monitor your eye health carefully.
- Hormone therapy or oral estrogen use can increase clotting risk
- Hyperviscosity syndromes or myeloproliferative disorders can raise your risk
- Elevated homocysteine levels and certain inherited thrombophilias may be relevant, especially in younger patients
- Sleep apnea should be evaluated and treated in coordination with your primary care provider, as it may disrupt normal blood flow to the eye
Several other health conditions can contribute to retinal vein occlusion. High cholesterol can lead to deposits in blood vessels that narrow the veins. Inflammatory diseases may cause blood vessel walls to swell and become blocked.
- Obesity increases pressure on blood vessels
- Smoking damages vessel walls and promotes clotting
- Sleep apnea may disrupt normal blood flow to the eye
- Rare inflammatory conditions can affect retinal veins
- Severe dehydration can contribute to blood thickening in some conditions, but routine hydration alone does not prevent retinal vein occlusion
How We Diagnose Retinal Vein Occlusion
When you come to our office with vision changes, we start with a thorough eye exam. We will ask about your symptoms, medical history, and any medications you take. Understanding your overall health helps us identify possible causes and plan your treatment.
We also check your visual acuity to measure how well you can see. This involves reading letters on an eye chart with each eye separately. We measure your eye pressure and examine the front structures of your eye before looking at your retina.
A dilated eye exam is essential for diagnosing retinal vein occlusion. We put drops in your eyes to widen your pupils, which allows us to see your entire retina clearly. After the drops take effect, we use special instruments to examine the back of your eye.
- We look for bleeding, swelling, or abnormal blood vessels on your retina
- We check the optic nerve for signs of damage or swelling
- We take photographs of your retina to document the condition
- In some cases, we may use OCT angiography or widefield imaging to assess blood flow and areas of poor circulation without injecting dye
- Your vision may be blurry for a few hours after dilation
An OCT scan creates detailed cross-sectional images of your retina. This painless test uses light waves to produce images that show the different layers of your retina. We can see exactly where fluid has accumulated and how much swelling is present.
OCT scans help us track changes over time and evaluate how well treatment is working. We may repeat this test at follow-up visits to monitor your progress and adjust your treatment plan if needed.
Fluorescein angiography is a special imaging test that shows blood flow in your retina. We inject a safe yellow dye into a vein in your arm, then take a series of photographs as the dye travels through the blood vessels in your eye. This test reveals which areas of your retina are not getting enough blood.
The images also show us if any abnormal new blood vessels have formed. This information helps us plan laser treatment or other therapies. Your skin and urine may have a yellow tint for a day or two after the test, which is normal.
Some people experience mild nausea, a warm flushing sensation, or a metallic taste during the injection. Serious allergic reactions are very rare but can include hives, difficulty breathing, or changes in blood pressure. Before the test, let us know if you have any allergies, heart or lung disease, or if you are pregnant or breastfeeding. Because your pupils will be dilated for this test, your vision will be blurry and you may be sensitive to light for several hours. Arrange for someone to drive you home or wait until your vision clears.
Because retinal vein occlusion is often linked to other health problems, we may recommend additional testing. Blood tests can check for diabetes, high cholesterol, clotting disorders, and inflammatory conditions. We might refer you to your primary care doctor or a specialist for further evaluation.
- Blood pressure measurements to assess cardiovascular health
- Blood sugar tests if diabetes is suspected
- Cholesterol and lipid panel to evaluate heart disease risk
- Complete blood count, homocysteine levels, and targeted thrombophilia testing in selected patients, especially younger individuals or those with personal or family history of clotting problems
- Referral to a hematology specialist may be recommended if a clotting disorder is suspected
Treatment Options for Retinal Vein Occlusion
Anti-VEGF injections are the standard treatment for macular edema caused by retinal vein occlusion in 2025. These medications block a protein called vascular endothelial growth factor that causes blood vessels to leak and new abnormal vessels to grow. We inject the medicine directly into your eye during an office visit.
- Commonly used anti-VEGF medicines are given as an injection into the vitreous gel of the eye
- Treatment usually starts with monthly injections for the first few months, then the interval is extended as swelling improves and your eye remains stable
- Common short-term effects include mild redness, a small floater or bubble that moves in your vision, and scratchiness for a day or two
- Rare but serious risks include infection inside the eye (endophthalmitis), retinal detachment, significant inflammation, and sustained eye pressure rise
- Call our office immediately if you develop severe pain, worsening vision, increasing redness, or pus-like discharge after an injection
The injections help reduce swelling, prevent vision loss, and may improve your sight. We numb your eye before each injection to minimize discomfort. The treatment has been shown to work well for many people with this condition.
In some cases, we may recommend steroid medication to reduce inflammation and swelling in the retina. Steroids can be given as an injection into the eye or as a slow-release implant that delivers medicine over several months. These treatments can be effective for controlling macular edema.
- Steroid implants may reduce the number of office visits needed
- We monitor for side effects like increased eye pressure or cataracts, which are more common with steroids than with anti-VEGF injections
- Steroids may be considered when anti-VEGF injections are not fully effective
- Some patients need additional treatments if eye pressure rises
Laser treatment is used to treat abnormal new blood vessels that can grow in ischemic retinal vein occlusion. When large areas of the retina are not getting enough oxygen, new fragile vessels may form and cause bleeding or a dangerous type of glaucoma. We apply scatter or panretinal photocoagulation to reduce the oxygen demand and lower the risk of these complications.
In branch retinal vein occlusion, focal or grid laser may sometimes be considered as an additional treatment if anti-VEGF injections alone are not enough to control macular swelling. Laser is not used as the main treatment for macular edema in central retinal vein occlusion. Laser photocoagulation is an outpatient procedure performed in our office.
The laser creates small controlled burns that seal off damaged vessels and reduce abnormal vessel growth. While laser treatment can prevent serious complications, it does not usually restore vision that has already been lost, though it can reduce the risk of further bleeding and vision decline. Laser may cause a slight reduction in peripheral or night vision in some cases.
Treating the root cause of your retinal vein occlusion is crucial for preventing future problems. We work with you and your other healthcare providers to manage conditions like high blood pressure, diabetes, and high cholesterol. Good control of these conditions protects not only your eyes but your overall health.
We may recommend lifestyle changes such as eating a heart-healthy diet, exercising regularly, maintaining a healthy weight, and quitting smoking. Taking your prescribed medications as directed is also important for keeping your blood vessels healthy.
Surgery is rarely needed for retinal vein occlusion, but it may be considered in specific cases with severe complications. If bleeding inside the eye does not clear on its own or if scar tissue forms and pulls on the retina, a procedure called vitrectomy might be recommended. This surgery removes blood and scar tissue from inside the eye. Vitrectomy carries risks including cataract acceleration, retinal detachment, infection, and bleeding.
If neovascular glaucoma develops due to abnormal new blood vessels growing in the front of the eye, treatment may include anti-VEGF injections, panretinal photocoagulation, and glaucoma procedures to control eye pressure and preserve vision.
- Vitrectomy may be considered when other treatments have not worked
- Surgery carries risks and is reserved for complicated cases
- We discuss all options with you to make the best decision for your situation
Recovery and Follow-Up Care After Retinal Vein Occlusion
In the first few weeks after diagnosis, we monitor you closely to see how your eye responds to treatment. Your vision may improve gradually, stay the same, or worsen depending on the severity of the blockage and swelling. Some people notice improvement within days, while others take weeks or months to see changes.
You may need frequent office visits at first so we can check your progress and provide additional injections if needed. Following our treatment plan and attending all scheduled appointments gives you the best chance for a good outcome.
After an injection, mild redness, a small moving bubble in your vision, or scratchiness are common and usually go away within 24 to 48 hours. Avoid rubbing your eye. Call our office promptly if you experience severe pain, a marked drop in vision, increasing redness, or any discharge from the eye.
Even with treatment, complications can develop. Persistent macular edema can continue to blur your central vision if not adequately controlled. Abnormal new blood vessels may grow on the retina or in the front of the eye, which can cause bleeding or a type of glaucoma called neovascular glaucoma.
If you have ischemic central retinal vein occlusion, we typically schedule monthly visits for the first four to six months. At each visit, we perform gonioscopy to examine the drainage angle of your eye and watch for early signs of new blood vessel growth on the iris or angle. Anti-VEGF treatment can temporarily suppress neovascularization, so consistent monitoring is important even while you are receiving injections. If treatment is stopped abruptly, abnormal vessels may regrow.
- We watch for signs of new blood vessel growth at each visit
- We measure your eye pressure to detect early glaucoma
- OCT scans help us track changes in retinal swelling
- Early detection of complications allows for prompt treatment
Making healthy lifestyle choices can help prevent retinal vein occlusion in your other eye and protect your overall health. Eating a balanced diet rich in fruits, vegetables, and whole grains supports good circulation. Regular physical activity helps control blood pressure, blood sugar, and weight.
If you smoke, quitting is one of the best things you can do for your eyes and blood vessels. Staying hydrated by drinking plenty of water keeps your blood flowing smoothly. Getting enough sleep and managing stress also contribute to better vascular health.
The frequency of your follow-up visits depends on the type and severity of your retinal vein occlusion and how well you respond to treatment. Initially, you may need appointments every few weeks for injections and monitoring. As your condition stabilizes, visits may be spaced further apart.
Even after your vision stabilizes, ongoing monitoring is important to watch for late complications. We create a personalized follow-up schedule based on your individual needs. Missing appointments can put your vision at risk, so keeping all scheduled visits is essential.
Contact us right away if you notice any sudden changes in your vision after starting treatment. New or worsening symptoms could signal a complication that needs urgent attention. If you experience a vision emergency outside of office hours, go to the emergency room and ask staff to contact an on-call eye specialist.
- Sudden decrease in vision that is worse than before
- New pain, redness, or sensitivity to light
- Sudden increase in floaters or flashes of light
- A shadow or curtain appearing in your field of view
- Any signs of infection after an injection
Frequently Asked Questions
Retinal vein occlusion happens when a vein carrying blood away from the retina is blocked, causing fluid and blood to leak into the retina. Retinal artery occlusion happens when an artery bringing oxygen-rich blood to the retina is blocked, cutting off the blood supply. Artery occlusion is often more severe and is considered a true medical emergency that may require immediate emergency room care to try to restore blood flow. Both conditions need urgent eye evaluation, but they are diagnosed and treated differently.
Not everyone needs ongoing injections indefinitely. Some patients require treatments for several months and then stabilize without further injections. Others need regular injections long-term to keep swelling under control. We tailor your treatment plan to your specific response and adjust it over time based on how your eye heals.
Your ability to drive depends on how much vision you have in both eyes and whether you meet your state's vision requirements for driving. If the affected eye has significant vision loss but your other eye sees well, you may still be able to drive safely. We can assess your vision and provide guidance, but check with your local motor vehicle department about specific regulations.
Retinal vein occlusion shares many of the same risk factors as stroke and heart disease, such as high blood pressure, diabetes, and high cholesterol. Having a retinal vein occlusion may be a sign that you have underlying vascular disease. We recommend that you see your primary care doctor to evaluate and manage your overall cardiovascular health.
Blood thinners and aspirin do not treat the eye condition directly. They do not reduce the swelling or restore vision from retinal vein occlusion. Do not start or stop any blood thinner or aspirin on your own without talking to your primary care doctor or cardiologist. These medicines may be recommended to you for other cardiovascular reasons, such as preventing stroke or heart attack, but the decision should be made by your medical team based on your overall health.
Laser treatment is used mainly to treat abnormal new blood vessels that can develop in ischemic retinal vein occlusion. If large areas of your retina are starved of oxygen, we apply panretinal or scatter laser photocoagulation to prevent bleeding and glaucoma. Laser is not the first-line treatment for macular swelling in central retinal vein occlusion. In branch retinal vein occlusion, focal or grid laser may be considered as an additional treatment if anti-VEGF injections alone do not fully control swelling. We will let you know if laser is recommended for your specific situation.
Getting Help for Retinal Vein Occlusion (Eye Stroke)
If you experience sudden vision changes, do not wait to seek care. Our eye doctors are trained to diagnose and treat retinal vein occlusion promptly to help preserve your sight. Early treatment offers the best opportunity for protecting your vision and preventing complications.