A year and a half later, Calverley, 57, doesn’t see colors well. He sees spots that aren’t there. And there are parts of his peripheral vision—to the left and up—where he can’t see anything at all.

“If I’m sitting there watching TV and the cat walks into the room, I don’t see it, because I don’t see out of the corner of my eye. I can be walking down the sidewalk and walk into a signpost because I don’t see it,” Calverley explains.

Now, a University of Alberta team is using mixed reality glasses to partially restore what’s missing for people like Calverley who have lost part of their peripheral vision due to a stroke or other brain injury. The paper is published in the Journal of Neuro-Ophthalmology.