MS-3684

A 67-year-old man arrives at the emergency department with a sudden onset of visual disturbance. He has a medical history of hypertension and takes amlodipine. He smokes 10 cigarettes daily.

During the eye examination, a field defect is observed in the right lower quadrant of both eyes. Apart from this, the examination is unremarkable.

What is the anatomical location of the lesion causing the vision problem?