Herpes Zoster (Shingles)
Herpes zoster is caused by the herpes simplex virus. It is the same virus which causes cold sores and genital herpes. Infection can be spread to the eye by touching an active lesion and then the eye. Such infections of the eye can lead to pain, swelling, redness, light sensitivity, and even blurred vision. It specifically affects the cornea of the eye through ulceration (keratitis). Repeated episodes of herpes zoster infection are associated with other eye conditions, including glaucoma, scarring inside the eye, and cataract formation.