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Kaplan-Meier curve of time to fellow eye involvement (up to 18 months) among 213 nonarteritic anterior ischemic optic neuropathy (NAION) patients without bilateral involvement at onset. Log-rank test P = .49 for comparing Kaplan-Meier curves between patients with NAION under age 50 (NAIONy, 43 of 105 patients [41%] with fellow eye involvement) and patients with NAION aged 50 and over (NAIONo, 32 of 108 patients [30%] with fellow eye involvement).
