Visual information travels from the eye to the brain via the optic nerve, a 3.5-mm-thick central nervous system structure approximately the same diameter as the cable connecting a video camera to a computer. As might be expected, damage to the optic nerve deprives the brain of visual input and causes visual loss. Nonarteritic anterior ischemic optic neuropathy (NAION) is the most common acute optic neuropathy of middle and late life, with an annual incidence of up to 10 cases per 100 000 individuals older than 50 years. 1 It is characterized by rapid and painless unilateral visual loss, altitudinal visual field defects, and optic disc swelling.
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Leonard A. Levin (2008) studied this question.
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