Learn About Retinal Artery Occlusion
Retinal artery occlusion is a blockage in one of the small arteries that carry blood to the retina. The retina is a layer of tissue in the back of the eye that is able to sense light.
Central retinal artery occlusion; CRAO; Branch retinal artery occlusion; BRAO; Vision loss - retinal artery occlusion; Blurry vision - retinal artery occlusion
Retinal arteries may become blocked when a blood clot or fat deposits get stuck in the arteries. These blockages are more likely if there is hardening of the arteries (atherosclerosis) in the eye.
Clots may travel from other parts of the body and block an artery in the retina. The most common sources of clots are the heart and carotid artery in the neck.
Most blockages occur in people with conditions such as:
- Carotid artery disease, in which the two large blood vessels in the neck become narrowed or blocked
- Diabetes
- Heart rhythm problem (mainly atrial fibrillation)
- Heart valve problem
- High levels of fat in the blood (hyperlipidemia)
- High blood pressure
- Intravenous drug abuse
- Temporal arteritis (inflammation of arteries due to an immune response)
If a branch of the retinal artery is blocked, part of the retina will not receive enough blood and oxygen. If this happens, you may lose part of your vision.
Sudden blurring or loss of vision may occur in:
- All of one eye (central retinal artery occlusion or CRAO)
- Part of one eye (branch retinal artery occlusion or BRAO)
The retinal artery occlusion may last for only a few seconds or minutes, or it may be permanent.
A blood clot in the eye may be a warning sign of clots elsewhere. A clot in the brain may cause a stroke.
There is no proven treatment for vision loss that involves the whole eye, unless it is caused by another illness that can be treated.
Several treatments may be tried. To be helpful, these treatments must be given within 2 to 4 hours after symptoms begin. However, the benefit of these treatments has never been proven, and they are rarely used.
- Breathing in (inhaling) a carbon dioxide-oxygen mixture. This treatment causes the arteries of the retina to widen (dilate).
- Massage of the eye.
- Removal of fluid from within the eye. An eye doctor uses a needle to drain a small amount of fluid from the front of the eye. This causes a sudden drop in eye pressure, which can sometimes cause the clot to move into a smaller branch artery where it will cause less damage.
- The clot-busting drug, tissue plasminogen activator (tPA).
The health care provider should look for the cause of the blockage. Blockages may be signs of a life-threatening medical problem.
Nicolas Feltgen practices in Goettingen, Germany. Mr. Feltgen is rated as an Elite expert by MediFind in the treatment of Retinal Artery Occlusion. His top areas of expertise are Retinal Artery Occlusion, Retinal Vein Occlusion, Mesenteric Venous Thrombosis, Vitrectomy, and Trabeculectomy.
Se Woo practices in Songnam, Republic of Korea. Woo is rated as an Elite expert by MediFind in the treatment of Retinal Artery Occlusion. Their top areas of expertise are Retinal Artery Occlusion, Age-Related Macular Degeneration (ARMD), Late-Onset Retinal Degeneration, Vitrectomy, and Cataract Removal.
Ilka Kleffner practices in Muenster, Germany. Ms. Kleffner is rated as an Elite expert by MediFind in the treatment of Retinal Artery Occlusion. Her top areas of expertise are Susac Syndrome, Retinal Artery Occlusion, Multiple Sclerosis (MS), Thrombectomy, and Stent Placement.
People with blockages of the retinal artery may not get their vision back.
Complications may include:
- Glaucoma (CRAO only)
- Partial or complete loss of vision in the affected eye
- Stroke (due to the same factors that contribute to retinal artery occlusion, not due to the occlusion itself)
Contact your provider if you have sudden blurring or vision loss.
Measures used to prevent other blood vessel (vascular) diseases, such as coronary artery disease, may decrease the risk for retinal artery occlusion. These include:
- Eating a low-fat diet
- Exercising
- Stopping smoking
- Losing weight if you are overweight
Sometimes, blood thinners may be used to prevent the artery from becoming blocked again. Aspirin or other anti-clotting drugs are used if the problem is in the carotid arteries. Warfarin or other more potent blood thinners are used if the problem is in the heart.
Summary: This prospective interventional study evaluates the efficacy and safety of direct intra-arterial microneedle injection combined with pars plana vitrectomy for acute retinal artery occlusion (including central retinal artery occlusion \[CRAO\] and branch retinal artery occlusion \[BRAO\] involving the macula or causing severe visual loss). The primary endpoint is best-corrected visual acuity (BCVA,...
Summary: Non-arteritic, thromboembolic central retinal artery occlusion (CRAO) is an acute neurovascular-ophthalmological emergency which leads to severe and permanent vision loss; no evidence-based therapy does exist. Two recent meta-analyses indicate early intravenous thrombolysis to be beneficial in CRAO. Therefore, the REVISION randomized placebo-controlled interventional trial will investigate intrave...
Published Date: January 29, 2024
Published By: Audrey Tai, DO, MS, Athena Eye Care, Mission Viejo, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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