Light sensitivity, or photophobia, is a medical condition that causes the eyes to hurt or show distress when exposed to strong illumination. Photophobia can be used as an indicator for diagnosing eye, brain, or systemic health problems. Light sensitivity has various causes, including medical conditions, surrounding elements, and working environments. Intense sunlight and artificial lighting lead to photophobia, a decline in performance by most workers, and generally poor health.

This fact sheet is part of our Ophthalmology and Optometry Information Guide series, developed to help people understand eye conditions and their impact on navigating the built environment.