Nonarteritic anterior ischemic optic neuropathy.

Nonarteritic anterior ischemic optic neuropathy (NAION) is the most common ischemic optic neuropathy and the most common type of optic neuropathy after glaucoma. It is a vascular optic neuropathy that is not related to inflammation, demyelinization, and compression and it is the most common visual loss due to optic nerve involvement. While incidence between the ages of 55-65 is increasing; factors affecting the etiopathogenesis and development of NAION and its treatment have not been clarified yet. This article summarizes the literature on the pathogenesis, clinical findings, diagnosis, and treatment of NAION.