Retinal Artery Occlusion: A Comprehensive Guide
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 24th, 2026.
Published on April 8th, 2026. Updated on August 28th, 2026.
Key Takeaways
Retinal artery occlusion is a medical emergency that blocks blood flow to the retina
It causes sudden, painless vision loss that can be permanent without immediate treatment
The condition affects about 1-2 people per 100,000 annually, typically those over 60
Most cases involve the central retinal artery, causing complete vision loss in the affected eye
Quick treatment within hours may help restore some vision and prevent further damage
Overview
Retinal artery occlusion happens when blood flow to your retina gets blocked. The retina is the light-sensitive tissue at the back of your eye that helps you see. When arteries feeding the retina become blocked, the retinal tissue doesn't get oxygen and nutrients it needs.
This condition is a true eye emergency. Most people experience sudden, painless vision loss in one eye. The vision loss can range from partial to complete, depending on which artery is blocked. Without quick treatment, the vision loss is often permanent.
Two main types exist: central retinal artery occlusion (CRAO) and branch retinal artery occlusion (BRAO). CRAO blocks the main artery feeding the entire retina. BRAO blocks smaller branch arteries, affecting only part of your vision. Both types require immediate medical attention to prevent lasting damage.
The blockage usually happens suddenly without any warning signs. You might be doing normal activities when your vision suddenly changes. This is why recognizing the symptoms and acting fast is so important for saving your sight.
Symptoms & Signs
Retinal artery occlusion typically causes sudden vision changes that develop within minutes to hours. The symptoms depend on which artery is blocked and how much of the retina is affected.
Primary Symptoms
Sudden, severe vision loss in one eye without pain
Complete or partial loss of visual field (areas you can't see)
Difficulty seeing objects in your peripheral (side) vision
Changes in color perception or brightness in the affected eye
When to Seek Care
Any sudden vision loss requires immediate medical attention. Don't wait to see if symptoms improve on their own. Dizziness with blurred vision can sometimes occur alongside retinal problems and needs prompt evaluation.
Many people describe the vision loss as a curtain or shadow covering part of their eye. The loss happens so fast that you might not realize it at first. Some people only notice when they cover their unaffected eye and see how bad the vision loss really is.
When to Seek Immediate Care
Go to the emergency room or call 911 if you experience sudden vision loss, especially if it's complete or affects your entire visual field.
Causes & Risk Factors
Retinal artery occlusion usually results from a blood clot or piece of plaque that blocks the artery. The blockage prevents oxygen-rich blood from reaching retinal tissue, causing the cells to die quickly.
The most common cause is an embolism - a clot that travels from elsewhere in your body. These clots often come from the heart or carotid arteries in your neck. Less commonly, inflammation of blood vessels or severe eye pressure can cause the blockage.
Heart conditions like atrial fibrillation make clots more likely to form. Plaque buildup in your arteries can also break loose and travel to your eye. Some people have blood disorders that make their blood thicker and more likely to clot.
Age
Most common in people over 60 years old
Genetics
Family history of cardiovascular disease increases risk
Lifestyle
Smoking, high cholesterol, and lack of exercise
Other Conditions
Diabetes, high blood pressure, heart disease, and glaucoma
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Diagnosis
Diagnosis must happen quickly. Acute retinal artery occlusion can signal disease in the brain, heart, or carotid arteries, so evaluation often includes an urgent stroke assessment as well as an eye examination. In adults over 50, doctors should also promptly consider giant cell arteritis, especially when headache, scalp tenderness, jaw pain, fever, or muscle aches are present.
Medical History & Physical Examination
Your doctor will ask about when your vision loss started and how severe it is. They'll also review your medical history, including heart problems, diabetes, and blood pressure issues. A complete eye exam includes checking your pupil responses and examining the back of your eye with special instruments.
Diagnostic Testing
Fundoscopy to look directly at your retina and blood vessels
Fluorescein angiography to see blood flow patterns in retinal vessels
Optical coherence tomography (OCT) to create detailed images of retinal layers
Blood tests to check for clotting disorders or inflammatory conditions
Heart tests like EKG or echocardiogram to find the source of clots
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Treatment Options
Treatment for retinal artery occlusion focuses on restoring blood flow quickly and preventing future blockages. The sooner treatment begins, the better the chances of saving some vision.
Conservative Treatments
Older treatments such as ocular massage have not been shown to reliably improve vision. Emergency specialists will determine whether any time-sensitive treatment is appropriate.
Do not try breathing into a paper bag or other home treatments. Sudden vision loss requires immediate evaluation in an emergency department or stroke center.
Eye-pressure-lowering procedures have also been used, but emergency specialists will determine whether they are appropriate.
Medicines to prevent future clots may be recommended after doctors identify the likely cause, such as a heart rhythm problem or carotid artery disease.
Advanced Treatments
Clot-dissolving treatment may be considered for carefully selected patients at specialized centers, but its benefits and risks remain uncertain and eligibility depends strongly on time since symptoms began.
Hyperbaric oxygen may be considered at some specialized centers, but availability is limited and evidence of benefit is uncertain. It should not delay emergency stroke and eye evaluation.
Surgery is not a routine treatment for retinal artery occlusion, although an eye specialist may treat separate eye complications if they occur.
Time is critical with retinal artery occlusion treatment. Every minute without blood flow damages more retinal cells. This is why doctors work as fast as possible once you arrive at the hospital.
Living with the Condition
Adapting to vision loss from retinal artery occlusion can be challenging. Many people need to make changes to their daily routines and living spaces to stay safe and independent.
Work with an occupational therapist to learn new ways to do everyday tasks. Good lighting becomes very important, especially for reading and cooking. Consider using magnifying devices and large-print materials. New eye pain, redness, swelling, or further vision changes should be reported promptly because they may have another cause.
You might need to adjust your home to make it safer with your new vision. Remove things from the floor that could trip you. Use bright tape or paint to mark stairs and door frames so you can see them better.
Exercise & Movement
Stay physically active to improve your overall health and prevent future blockages. Walking, swimming, and gentle stretching are usually safe. Avoid activities that could increase your risk of falls or eye injury. Always check with your doctor before starting new exercise routines.
Staying active helps your heart stay healthy and strong. Regular movement also helps you stay mentally healthy while adapting to vision changes. Your doctor can suggest the best exercises for your situation.
Prevention
Control blood pressure and cholesterol through diet, exercise, and medications
Manage diabetes carefully with regular blood sugar monitoring
Don't smoke, or quit if you currently smoke tobacco products
Take blood thinners as prescribed if you have heart rhythm problems
Get regular eye exams, especially if you have risk factors like glaucoma
Eating healthy foods and staying active are important for preventing blood clots. Include plenty of fruits, vegetables, and fish in your diet. Drink plenty of water and limit salt and sugar. These healthy habits protect your heart and your eyes.
Frequently Asked Questions
Some vision may return if treatment begins within hours of symptom onset. However, complete recovery is rare. Most people have some permanent vision loss, though the amount varies greatly between individuals.
Retinal artery occlusion is sometimes called an "eye stroke" because it involves blocked blood flow. However, it specifically affects the eye's blood vessels rather than the brain. Both conditions require emergency treatment.
While retinal artery occlusion usually affects only one eye, having it increases your risk for similar problems. The underlying conditions that caused it could affect your other eye or cause other cardiovascular problems.
Unlike infections or styes, retinal artery occlusion doesn't cause eye pain or redness. The sudden, painless vision loss is the main distinguishing feature that sets it apart from other eye problems.
Regular monitoring with an eye doctor is essential after retinal artery occlusion. You'll also need ongoing care for underlying conditions like diabetes, high blood pressure, or heart disease. Black eye symptoms are different and usually result from injury rather than vascular problems.
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