16. Ophthalmic manifestations
It is known as herpes zoster ophthalmicus, resulting from the invasion of the Gasser ganglion. This type of herpes zoster happens in 10-15% of patients and includes many ophthalmic lesions, including conjunctivitis, keratitis, scleritis, retinitis, and optic neuritis. Most of the manifestations are inflammatory processes, but other symptoms include lid retraction, ptosis, exophthalmos, and glaucoma. Some patients will also have muscle palsies around the eyes. Patients usually have skin lesions in the forehead and other areas of the affected dermatome. This manifestation of herpes zoster can be very dangerous and leave long-lasting visual impairments when not adequately treated.