30th April 2024

A 60-year-old man with a 15-year history of type 2 diabetes presents with gradual vision loss in both eyes over the past six months.

A 60-year-old man with a 15-year history of type 2 diabetes presents with gradual vision loss in both eyes over the past six months. He reports difficulty reading and seeing fine details. His last eye examination was two years ago. There is no pain or redness in the eyes, and no history of headaches or vomiting.

Which investigation is most appropriate to confirm the diagnosis?