Intermittent headaches as the presenting sign of subacute angle-closure glaucoma.

Subacute angle closure causes intermittent episodes of transiently elevated intraocular pressure. Headache is often the chief complaint, which may lead to misdiagnosis. The authors examined headache characteristics and consequences of delayed diagnosis. Patients presenting with headaches have a substantial delay in diagnosis, contributing to permanent ocular damage and glaucoma. Patients with subacute angle closure misdiagnosed with migraine are older and have shorter-duration headaches than patients with typical migraine.