Nonarteritic anterior ischemic optic neuropathy in a child with optic disk drusen.

Optic disk drusen are calcific deposits that form in the optic nerve head secondary to abnormalities in axonal metabolism and degeneration. The clinical course is variable, ranging from stable vision to acute or progressive visual loss. We evaluated a healthy 12-year-old boy with a history of asymptomatic bilateral disk drusen who presented with acute painless unilateral visual loss after hiking to an altitude of 11,000 feet. Findings were consistent with nonarteritic anterior ischemic optic neuropathy.