Anterior Ischemic Optic Neuropathy Most patients with AION notice a sudden disturbance in their vision. Anterior Ischemic Optic Neuropathy – Patient Informational Brochures (NANOS) in multiple languages Anterior Ischemic Optic Neuropathy – Materials from the NOVEL collections Medline – MeSH search on Optic Neuropathy, Ischemic Optic Neuropathy, Anterior Ischemic – eMedicine from WebMD (WebMD)