Retinal Vein Occlusion
Diseases of the Retina / Vitreous: Retinal Vein Occlusions
What are Retinal Vein Occlusions?
A Retinal Vein Occlusion is a blockage or obstruction of the veins in the retina. The retina is the light-sensitive layer of tissue that lines the back wall of the eye and is responsible for vision.
There are two forms of Retinal Vein Occlusions:
- Central Retinal Vein Occlusions (CRVO) – occur when the main retinal vein is blocked, causing the blood flow to be reduced to the entire retina. This can cause a marked decrease in vision, as well as pain with an increase in eye pressure.
- Branch Retinal Vein Occlusions (BRVO) – occur when a branch of the main retinal vein becomes obstructed. Blood flow is reduced in a portion of the retina. The amount of vision loss is usually not as severe as in CRVO.