At first glance, this white substance covering the upper-third of a patient’s iris, like some sort of gelatinous Cadbury Top Deck, looks as though it could be a hypopyon.

But turn that diagnosis on its head.

The milky layer was noted during a routine eye exam of a 69-year-old man with type 2 diabetes.

Three years earlier, the patient had undergone cataract surgery and a vitrectomy of the right eye for retinal detachment. Visual acuity was 20/400 in the affected right eye and 20/40 in the left.