trigeminal nerve

Herpes Zoster Ophthalmicus

Herpes Zoster Ophthalmicus

Herpes Zoster Ophthalmicus (HZO) is defined by involvement of the ophthalmic branch of the trigeminal nerve (CN V1). This branch supplies the forehead, the anterior scalp, the side and tip of the nose, ethmoidal sinuses, and importantly, all structures within the globe, including the retina and optic nerve. Zoster involving the maxillary division of the trigeminal nerve (CN V2) is not globe threatening, and does not require referral to an ophthalmologist.
The classic vesicular rash can result in significant upper facial oedema, which is often misdiagnosed as periorbital cellulitis. Secondary bacterial infection involving the eyelids is actually quite uncommon, and systemic antibiotics are seldom required. Read Moreā€¦