Central Retinal Vein Occlusion

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Central Retinal Vein Occlusion, Adult

Central retinal vein occlusion (CRVO) is a blockage (occlusion) in the main (central) vein that drains blood away from a layer of tissue at the back of your eye (retina). The retina is the layer of nerve cells in the back of the eye that senses light and sends signals to the brain for vision.
When you have CRVO, a blood clot forms inside your central retinal vein. This can happen suddenly or gradually. The clot causes blood and fluid to leak out of the central retinal vein. The blood and fluid collect in the central area of your retina (macula). This causes vision loss or blurred vision in the affected eye. The blurriness or loss of vision may be complete or partial. Partial loss may get worse over hours or days.

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Atherosclerosis can slow blood flow and contribute to clot formation. CRVO is also more likely to develop in:
• People who are age 50 or older.
• People who have any of the following medical conditions:
○ High blood pressure.
○ Diabetes.
○ Increased pressure inside the eye (glaucoma).
○ Increased blood clotting.

The main symptom of this condition is a sudden and painless vision loss or blurring in one eye. Other symptoms include:
• Tiny spots or clumps that move across your vision (floaters).
• Pain or pressure in your eye. This occurs in very bad cases.

This condition is usually diagnosed by a health care provider who specializes in eye diseases (ophthalmologist). The ophthalmologist will do a complete eye exam. You may have tests, such as:
• A vision test.
• An exam to check your retina after getting eye drops to open the pupil (slit-lamp exam).
• An imaging study of your retinal blood flow after dye has been injected into your bloodstream (fluorescein angiogram).
• A measurement of the pressure inside your
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