Anterior ischemic optic neuropathy (AION) occurs when there is not enough blood flow into the eye. This causes damage to the optic nerve, quickly leading to vision loss. There are two subtypes of AION including arteritic (A-AION) and nonarteritic (NA-AION). NA-AION makes up nearly 85% of all AION cases. Both conditions arise when there is...
