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Anti-acetylcholine receptor antibodies (AChR Abs) are detected in 85% of myasthenia gravis (MG) patients, at higher rates in patients with late-onset disease. AChR Ab frequency is generally thought to be much lower in ocular MG (OMG), although recent studies reported positivity rates higher than 70%. We hypothesized that the improved AChR Ab diagnostic yield in OMG could be related to an increased frequency of late-onset disease, as observed in generalized MG. We compared OMG patients, with disease onset before or after 1998, for the age of onset, sex, pres