Anterior ischemic optic neuropathy

Damage to the optic nerve's front part due to lack of blood flow

Anterior ischemic optic neuropathy (AION) is a medical condition involving loss of vision caused by damage to the anterior portion of the optic nerve as a result of insufficient blood supply (ischemia). This form of ischemic optic neuropathy is generally categorized as two types: arteritic AION, in which the loss of vision is the result of an inflammatory disease of arteries in the head called temporal arteritis, and non-arteritic AION, which is due to non-inflammatory disease of small blood vessels. It is in contrast to posterior ischemic optic neuropathy, which affects the retrobulbar portion of the optic nerve.

This keyword could refer to multiple things. Here are some suggestions: