Fig. 2
From: Optic disc edema with decreased visual function after high-altitude exposure
Fundus photographs taken at 25 days (A, B) and visual field evolution in the right eye (A, C, E, G) and left eye (B, D, F, H) at 10 days (C, D), 50 days (E, F), and 70 days (G H) after disease onset, respectively. At onset, there was a diffuse peripheral visual field defect, which gradually improved to residual inferior altitudinal loss. This type of visual field defect is the most common in non-arteritic anterior ischemic optic neuropathy (NAION)