Anterior ischemic optic neuropathy (AION).

Diffuse optic nerve edema with flame/splinter/nerve fiber layer hemorrhages, telangiectasias, and nerve fiber layer whitening.

By definition, anterior ischemic optic neuropathy necessitates the presence of optic nerve edema, either by history (noted by other physicians), fundus photography, or other objective methods. AION never presents acutely with a normal or pale optic nerve.

Image credit: American Academy of Ophthalmology. Used with permission for educational purposes.