Microbial keratitis requires urgent referral to an ophthalmologist. Delay in presentation (of as little as a few hours) can result in corneal perforation requiring surgical management.

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.