[Nutritional, toxic and drug-induced optic neuropathies]

Painless, bilateral, insidious loss of central vision associated with dyschromatopsia should alert the physician to the possibility of a nutritional, toxic or iatrogenic optic neuropathy, sharing similar clinical features. Given the increasing number of available drugs for systemic disorders, a variety of newly introduced medications have been related to toxicity on the optic nerve. Detecting the cause in the early stages of the disease is mandatory, as withdrawal of the toxic agent may result in vision recovery.