Drug-induced myopia, hyperopia and accommodation disorders.

Myopia, hyperopia and accommodation disorders are common refractive disorders, usually due to anatomical abnormalities or to physiological aging. They can also be functional, however, particularly when provoked by drugs. Drug-induced refractive disorders resolve after treatment cessation. All drugs acting on the autonomic nervous system can affect vision. Other drugs have unpredictable effects: the mechanism is not always known but sometimes appears to involve changes in the hydration of various ocular structures.