Visual difficulties are common in patients with temporal arteritis. They may be the presenting manifestation of the disease or may occur at any time during its course. The visual deficits that occur in patients with temporal arteritis are most often loss of visual acuity or visual field; however, some patients develop double vision or other symptoms of ocular motor dysfunction. Knowledge of the visual deficits associated with temporal arteritis can aid in the diagnosis of the disorder, and early diagnosis of temporal arteritis can often prevent such deficits from developing.