A 61-year-old woman with hypertension and type II diabetes mellitus comes to emergency for a 3-hour history of loss of vision in her right eye. Ophthalmologic examination shows a cholesterol embolus in the right retinal artery. Which of the following is the most likely cause?
Carotid atherosclerosis
Diabetic retinopathy
Hypertensive retinal artery changes
Left atrial mural thrombus
Optic neuritis
