MS-3504

A 59-year-old man arrives at the emergency department with a sudden onset of visual disturbance. He has a medical history of hypercholesterolemia and is currently taking atorvastatin. Additionally, he smokes 15 cigarettes daily, drinks half a bottle of wine each night, and works as a bond-trader.

Upon examination of his eyes, a field defect is observed in the right upper quadrant of both his right and left eye. Other than that, the examination is unremarkable.

What is the anatomical location of the lesion that is affecting his vision?