Non-Arteritic Anterior Ischemic Optic Neuropathy and Arteritic Anterior Ischemic Optic Neuropathy

Non-arteritic anterior ischemic optic neuropathy vs. arteritic anterior ischemic optic neuropathy.

ONH appearance in nonarteritic anterior ischemic optic neuropathy (NAION) and arteritic anterior ischemic optic neuropathy (AAION).

A) The healthy eye demonstrates a characteristic crowded appearance, which has been called “disc at risk.”

B) ONH appearance in NAION. Edema is segmental, with mild superimposed pallor and flame hemorrhages.

C) The healthy eye demonstrates a normal cup–disc ratio. Lack of a disc at risk should suggest an AAION.

D) ONH appearance in AAION. Pallor is more pronounced.

Image credit: Parts A, B courtesy of Michael S. Lee, M.D.; parts C, D courtesy of Rod Foroozan, M.D.. American Academy of Ophthalmology. Used with permission for educational purposes.