Retinal migraine is a rare and poorly understood migraine variant. Vasospasm of the retinal or ophthalmic artery is thought to be the cause of the amaurosis of ocular migraine. Transient visual disturbance and headache fulfilling the criteria for migraine are essential for diagnosis. However, some cases were reported without classical headache attack. We report a case of recurrent transient monocular blindness without accompanying headache improved by beta-blocker.