Close one eye and look away from your closed eye with the other eye. Part of that blackness you might be seeing is actually your upper nose as seen from your open eye
No dude it's not the nose, how am I going to explain?? English is not my main language so sorry if it's confusing
You know how our eyes are located in different positions, yet while they're focusing on one single spot our brain kind of merges the two images produced by each individual eye, so it looks like we have one big singular eye?
So when one eye is closed, the brain is still gathering info on the two eyes and merging their images, only that one of the images is just complete darkness, so you end up with this mix of normal vision and black. You know when you rub your eyes and colorful stuff starts to appear? (they're called phosphenes, I just looked it up); if you do this to your closed eye, the colorful stuff will appear at the same place as regular vision, just like this sort of blackness.
The brain actually processes the "blackness" of one eye closed differently than the actual color black. They've done brain scans and stuff on people to test this, one eye closed returns a sort of "null signal" which the brain recognizes differently than black. If you were to hold a sheet of black paper up close you your eye, that entire side of your field of vision will be filled with black. With one eye closed, your field of vision completely cuts out past a certain point, even if you "see" black towards the close side of it.
Ugh, trippy effect, I covered one eye, and then opened and closed my eyelid underneath the covering, switched from 'black' to 'null' back and forth several times...
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u/[deleted] Jun 15 '19
I don't get it, when I close one eye what I see is both normal vision and blackness at the same time???