When I look at a white wall, sky etc, I often see a momentary white crescent which almost immediately disappears. I noticed this 9 days ago, but might have been around long before then without me really registering it.
Went to the hospital to get my pupils dilated and check the retina for any tears or anything. The lady found no problems apart from lots of floaters and suggested it was a type of floater. But this is not a floater, or at least it doesn't float, and only has a momentary existence. Anyone have any suggestions?