NAAIONNon-Arteritic Anterior Ischemic Optic Neuropathy (ophthalmology)
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NAAION (Figure 10) is the most common acute optic neuropathy in patients over the age of 50 years.
The optic disc oedema in NAAION may be diffuse or segmental, hyperaemic or pale.
There is no proven treatment for NAAION. In one study, patients were seen within two weeks of the onset of visual loss, with initial visual acuity of 20/70 or worse and an improvement was reported in 41-43% and a worsening in 15-19% at six months.