Visual outcome following bilateral non-arteritic anterior ischemic optic neuropathy: a systematic review and meta-analysis.

Even though a weak connection exists between visual outcome in both eyes following bilateral NAION it is still impossible to predict with certainty the visual outcome of a sequential contralateral NAION event based on the severity of visual loss in the first affected eye. Measures often taken after the first event are ineffective in improving the visual outcome of a second event should it occur.