Herpes zoster ophthalmicus: frequency and risk factors for developing uncommon ocular manifestations.

Objective: To determine the frequency of herpes zoster ophthalmicus (HZO) and assess risk factors for developing uncommon ocular manifestations of laboratory-verified HZO.

Design: Retrospective cohort study.

Methods: The frequency of HZO out of all herpes zoster cases was calculated using International Classification of Diseases codes for patients seen at the University of Pittsburgh Medical Center from January 1, 2004 to October 31, 2021.