Recognition of herpes zoster ophthalmicus.

Herpes zoster ophthalmicus is a form of herpes zoster. Approximately 10 to 25 percent of zoster cases are ophthalmicus. The process is caused by reactivation of latent varicella virus affecting the fifth cranial nerve. Recognition of signs and symptoms leading to early diagnosis and treatment with acyclovir may alter the course and diminish damage to ocular structures.