Herpes zoster optic neuritis.

Herpes zoster (HZ) is an acute infection caused by reactivation of the latent varicella-zoster virus [1]. Herpes zoster ophthalmicus (HZO) occurs when inflammation spreads from the ganglion of Gasser to the ophthalmic branch of the trigeminal nerve. Optic neuritis, a very rare sequela of HZO [2-4], can occur simultaneously to the acute vesicular skin eruption or, more frequently, as a postherpetic complication.