MSFinals-3784

MSFinals-3784

An 80-year-old man arrives at the emergency department with a sudden painless loss of vision in his left eye. He has noticed a decline in his vision over the past few months, but attributed it to his age. He has a history of smoking 30 cigarettes daily for the last 45 years and well-controlled hypertension. The left eye has a visual acuity of 6/30, while the right eye has a visual acuity of 6/12. A central scotoma is evident on visual field testing. Fundus examination is being conducted after administering mydriatic eye drops. What is the most specific finding for the underlying cause of his presentation?