Severe occlusion of the<unk>  causes ocular ischemic syndrome. As with central retinal<unk>  occlusions,<unk>  occlusions may result from systemic cardiovascular diseases; however, a cherry-red spot is typically absent and the vision is usually worse. Amaurosis fugax is a temporary loss of vision that occurs in two conditions which cause a temporary reduction in<unk>  pressure: orthostatic hypotension and positive acceleration. Even complete occlusion of the<unk>  may possibly leave the eye without symptoms, probably because of circulatory anastomoses
Ophthalmic artery
Central retinal artery
Trigeminal artery
Internal carotid artery
Pontine arteries
Caliber persistent artery
Abbott's artery
Oculomotor nerve