Central Hemiretinal Arterial Occlusion

A 65-year-old woman with a history of hypertension and cigarette smoking presented with complete loss of vision in the inferior field of the left eye, which she had noticed an hour before presentation. She reported having had two transient episodes of amaurosis in the left eye the previous day. Visual acuity was 20/20 in both eyes. Dilated ophthalmoscopy of the left eye revealed a nonrefractile plaque in the proximal superior retinal artery (Panel A, arrow). Superficial retinal whitening in the superior macula signified retinal ischemia (Panel A, arrowheads). Fluorescein angiography showed delayed vascular filling in the superior retinal arteries (Panel . . .