Retinal Vein Occlusion

Retinal Vein Occlusion

Diseases of the Retina / Vitreous: Retinal Vein Occlusions

What are Retinal Vein Occlusions?

Diagram of the human eye

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.

Learn more about Retinal Vein Occlusions by clicking on the + to the left of each heading.

What Causes Retinal Vein Occlusions?
What are the Symptoms of Retinal Vein Occlusions?
How is a Retinal Vein Occlusion Detected?
What are the Treatment Options?
What You Can Do to Protect Your Vision
Making the Most of Your Remaining Vision