You somehow magically sense something there through your eyes, but you don’t see it at all. It’s stronger if you don’t look at it directly and move your head about a little. It’s like there’s an unconscious observer reporting where things are, and you just take the info and acknowledge it, but you don’t see it. Anyone else get this?
Yeah, we did a lab on this in college. Rods are sensitive enough to be triggered by <10 photons, cones take around 100x more to fire.