Retinal vein occlusion is usually caused by a blood clot blocking the vein. But a nearby artery can sometimes be the problem. Arteries and veins cross over each other in the retina.

Branch retinal vein occlusion (BRVO) is when a blockage forms in the veins branching off the retina, which can disrupt blood flow. Treatment depends on the type of blockage and severity of the damage.

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About. Retinal Vein Occlusion (RVO) is a serious eye condition that occurs when one of the veins responsible for draining blood from the retina becomes partially or completely blocked.