What is BRVO and CRVO?

Vein Occlusions 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 or 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.