Headache attributable to disorders of the eye.

Sensory innervation to the eye and periocular area arises from the ophthalmic branch of the trigeminal nerve. Thus, ocular, orbital, and systemic disorders may produce head pain with ocular signs and symptoms. Whereas some of these entities have characteristic diagnostic features, others mimic primary headache disorders such as migraine and cluster headache. This article reviews common ocular and neuro-ophthalmic conditions that are accompanied by pain in or near the eye.