I was on my computer, just looking at the screen when in the top "corner" of my eyes I see what I can best describe as a small flashing pitch black shadow on the wall above my screen. Almost like a bright black in terms of how contrasted it was against the wall. Looked about the size of a hand? Kind of looked like a glitch in a video game where maybe a there's a patch of black pixels that briefly appears/flashes. When I looked right at it it disappeared.
I was really freaked out because I'd never seen something like that especially since it was very vivid. I searched up what it could be and retinal detachment showed up, but never said anything expressed specifically as something very dark and black. Is it possible that that's what it could be though? I currently feel and see normal, but it happened like 15 minutes ago
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