Temporal arteritis, also called giant cell arteritis, is a potentially blinding disorder of both eyes. It tends to occur in people older than 65 years of age. Patients present with unilateral decreased vision, an afferent pupillary defect, optic nerve swelling (shown), and tenderness over the forehead and scalp. Patients may complain of pain with chewing, or jaw claudication, and there may be symptoms of polymyalgia rheumatica. Involvement of the second eye may quickly follow if untreated.