<unk> , also<unk> , is when the central<unk>  vein becomes occluded, usually through thrombosis. The central<unk>  vein is the venous equivalent of the central<unk>  artery and both may become occluded. Since the central<unk>  artery and vein are the sole source of blood supply and drainage for the<unk>  such occlusion can lead to severe damage to the<unk> and blindness, due to ischemia (restriction in blood supply) and edema (swelling).<unk>  can cause ocular ischemic syndrome. Nonischemic<unk>  is the milder form of the disease. It may progress to the more severe ischemic type.<unk>  can also cause glaucoma.
Central retinal vein occlusion
Branch retinal vein occlusion
Branch retinal artery occlusion
Retinal vasculitis
Central retinal artery occlusion
Arteritic anterior ischemic optic neuropathy
Posterior ischemic optic neuropathy
Ischemic optic neuropathy