MSFinals-3874

A 55-year-old man visited his GP complaining of a gradual blurring of vision in his right eye. He underwent cataract surgery on the same eye five years ago. Despite wearing reading glasses, he noticed no improvement. During the examination, his left eye had a visual acuity of 6/18, while his right eye had a visual acuity of 6/9. What possible diagnosis could explain his symptoms in the right eye?