Vein Occulsions
What is BRVO and CRVO?
What is BRVO and CRVO?
Branch Retinal Vein Occlusion (BRVO) and Central Retinal Vein Occlusion (CRVO) are vein occlusions of the eye. A vein occlusion occurs when there is a blockage in the small veins that carry blood away from the retina. The retina is a thin tissue layer at the back of the eye that converts light to the images you perceive. BRVO, or the blockage of small veins in the retina, often occurs when retinal arteries that have been thickened and hardened put Pressure on a retinal vein and it becomes blocked. When there is a blockage of the vein the nerve cells in the retina may die, causing loss of vision. CRVO is a blockage of the main vein in the retina. The blockage causes the walls of the vein to leak fluid into the macula, or the part of the retina responsible for central vision.
Symptoms Include:
- Cloudy
- Blurry vision
- Problems with light these can include headlights that seem too bright at night; glare from lamps or very bright sunlight; or a halo around lights.
- Colors that seem faded.
- Poor night vision.
- Frequent changes in your eyeglasses or contact lenses.
Retinal vein occlusion happens when the vein is blocked, most commonly by a blood clot.
Some of the symptoms of RVO include sudden blurry vision or loss of vision. These symptoms are not associated with any pain, and only one eye tends to be affected. Other symptoms may include inflammation in the macula and formation of new blood vessels that may bleed into the vitreous gel and cause floaters in vision. These new blood vessels may also lead to changes in the pressure of the eye, which may lead to glaucoma. In severe cases, a person can become blind.
There is no official treatment for RVO, but many times a physician can begin treatment for the underlying condition that has caused the blood clot to form. In order to stunt the growth of new blood vessels, pan-retinal photocoagulation therapy may be needed. In addition, injections of corticosteroids and Vascular Endothelial Growth Factor (VEGF) are given to help manage the inflammation within the eye. Furthermore, focal laser therapy is effective in reducing swelling caused by inflammation.
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