[epmaybe]

This kind of already fits a little bit with how the brain processes images where there is information lacking. Neurocognitive specialists can likely correct me on the following.

Glaucoma is a disease where one slowly loses peripheral vision, until a small central island remains or you go completely blind.

So do patients perceive black peripheral vision? Or blurred peripheral vision?

Not really…patients actually make up the surrounding peripheral vision, sometimes with objects!