So I already have pretty weird vision(diplopia) and I even have prism lenses. But, over the course of a year, I've had blackouts. I will simply be walking or doing my usual thing when everything would suddenly go black for a good ten seconds. I know I don't blink or close my eyes. I don't get dizzy, I don't spend a lot of time on the computer, and I'm pretty healthy. What's going on?