Headaches as the main presenting symptom of subacute angle closure glaucoma.

The diagnosis of subacute angle closure glaucoma is suspected in patients with narrow angles of the anterior chamber of the eye, presenting with periodic ocular, or periocular pain. However, some patients may present with headaches in the absence of significant ocular discomfort, which often leads to misdiagnosis and delay in specific therapy. The clinical features of 9 such patients are described. Subacute angle closure glaucoma should always be considered in the differential diagnosis of adult-onset headaches.