Herpes Zoster Ophthalmicus (HZO) is the reactivation of varicella zoster virus infection in the ophthalmic branch of the trigeminal nerve. Ocular complications of HZO include keratitis, uveitis, trabeculitis and, less commonly, optic neuritis and cranial nerve palsy. HZO can lead to chronic and recurrent ocular inflammation and secondary glaucoma.
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