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Objective: To better define the concordance of visual loss in patients with nonarteritic anterior ischemic optic neuropathy (NAION)., Methods: The medical records of 86 patients with bilateral sequential NAION were reviewed retrospectively, and visual function was assessed using visual acuity, Goldmann visual fields, color vision, and relative afferent papillary defect. A quantitative total visual field score and score per quadrant were analyzed for each eye using the numerical Goldmann visual field scoring method., Results: Outcome measures were visual acuity, visual field, color vision, and relative afferent papillary defect. A statistically significant correlation was found between fellow eyes for multiple parameters, including logMAR visual acuity (P=.01), global visual field (P<.001), superior visual field (P<.001), and inferior visual field (P<.001). The mean deviation of total (P<.001) and pattern (P<.001) deviation analyses was significantly less between fellow eyes than between first and second eyes of different patients., Conclusions: Visual function between fellow eyes showed a fair to moderate correlation that was statistically significant. The pattern of vision loss was also more similar in fellow eyes than between eyes of different patients. These results may help allow better prediction of visual outcome for the second eye in patients with NAION.