<unk>  can be classified based on it pathogenesis, as arteritic versus non-arteritic. Non-arteritic<unk>  is most commonly caused by an embolus and occlusion at the narrowest part of the carotid<unk>  artery due to plaques in the carotid artery resulting in carotid<unk>  artery atherosclerosis. Further causes of non-arteritic<unk>  may include vasculitis and chronic systemic autoimmune diseases. Arteritic<unk>  is most commonly caused by giant cell arteritis. Other causes can include dissecting aneurysms and arterial spasms, and as a complication of patient positioning causing external compression of the eye compressing flow to the central<unk>  artery (e.g. in spine surgeries in the prone position).
Central retinal artery occlusion
Branch retinal artery occlusion
Branch retinal vein occlusion
Retinal vasculitis
Central retinal vein occlusion
Arteritic anterior ischemic optic neuropathy
Posterior ischemic optic neuropathy
Ischemic optic neuropathy