Anticholinergic visual hallucinosis from atropine eye drops.

A 37-year-old man with type I diabetes mellitus and chronic renal failure presented to the emergency department complaining of hallucinations. He was 5 days postoperative for left pars plana vitrectomy and intra-ocular lens implantation and had been taking ophthalmic atropine, tobramycin and prednisolone. He had presented 5 months earlier, on the same ophthalmic medications, with postoperative hallucinations after a right pars plana vitrectomy. Visual hallucinations are a major side effect of anticholinergic poisoning. Ophthalmic instillation of atropine has been documented to cause many central nervous sytstem symptoms, including hallucinations.