Ocular manifestations of drug abuse.

Abuse of drugs, including some used clinically and others with no legal or clinical use, can cause ocular injury and disease. Ocular manifestations of drug abuse may be due to the substances themselves, to invasive methods of administration, or to injury suffered during states of altered consciousness. Grouping the drugs into five categories (opiates, marijuana, stimulants, depressants and hallucinogens), the authors describe the pharmacologic, congenital, toxic, infectious, embolic, and psychological ocular manifestations of their abuse.