D2I2.
vascular

Retinal vein occlusion

Central vein occlusion, also CRVO, is when the central retinal vein becomes occluded, usually through . The central retinal vein is the equivalent of the central retinal and both may become occluded. Since the central retinal artery and vein are the sole source of blood supply and drainage for the , such occlusion can lead to severe damage to the retina and blindness, due to and edema (swelling).

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Plain-language summary adapted from Wikipedia. Not medical advice.