Review Question - QID 108987

A 71-year-old woman arrives to clinic with sudden vision loss. She was in her usual state of health until waking up this morning unable to see out of her right eye. She denies pain, but reports her right eye “feels funny.” The patient’s medical history is significant for a previous myocardial infarction, hypertension, and osteoporosis. Her current medications include aspirin, metoprolol, rosuvastatin, lisinopril, and alendronate. Her temperature is 98°F (36.7°C), blood pressure is 145/86 mmHg, pulse is 62/min, and respirations are 12/min with an oxygen saturation of 98% on room air. The patient's pupils are symmetric in size and equally reactive to light with accommodation. A fundoscopic exam of the right eye is shown in Figure A. The left optic fundus is unremarkable. Which of the following is the most likely diagnosis?