<prompt> Which one of the following patterns of visual disturbance would be predicted to be demonstrable on examination of this patient?Inferior hemifield lossTemporal quadrantanopsiaUniocular blindnessMacular sparing hemianopia  <response>: Answer A. Inferior hemifield lossDilated ophthalmoscopy of this left eye illustrates a nonrefractile plaque in the proximal superior retinal artery with retinal whitening in the superior macula signifying retinal ischemia. Superior retinal ischemia will result in a defect in the inferior visual field, as in this patient. A diagnosis of hemiretinal arterial occlusion was made. 