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To study the effect of levodopa in improving visual function in patients treated within 45 days of onset of nonarteritic anterior ischemic optic neuropathy (NAION).Nonrandomized, retrospective, comparative trial.The study involved 37 patients with NAION of less than 45 days duration.Eighteen patients who had been treated with levodopa were assigned to the case group, and 19 untreated patients were...