Anterior Ischemic Optic Neuropathy (AION)

AION is the most common cause of sudden decreased vision in patients older than 50 years.


Most patients with AION notice a sudden blurriness, dimness or darkness, often above or below where they are looking. Central vision also may be disturbed. Usually there is no discomfort, redness or tearing. Patients with tenderness in their temples or pain when chewing may have a different cause of decreased vision and should bring these symptoms to their doctor’s attention.

Treatment Options

There is no proven treatment for patients with AION; however, many will recover some of their vision which will then remain stable. It is important that their blood pressure be monitored and that they stop smoking.

View patient education videos to learn more