I cannot fathom seeing nothing as opposed to just seeing pitch black. An example I was told is “it’s like trying to see out of your elbow”. I still do not get it
In: Biology
The eyes give sensor input and darkness is a sensory input.
You can look into darkness and your eyes will pass information to your brain which will be processed, so you will simulate your brain.
Close one eye. You don’t see black on the affected side. Your field of vision is simply narrower.
Close both eyes. You do see back. Your brain has no (or insignificant) visual input so it sees black.
In practice if you lost both eyes you would still see black because your brain is used to the visual input.
Certain people who are blind from birth would have no concept of sight and as such would see “nothing”. In practice the vast majority of blind people do have some degree of visual sensitivity.
There is a blind spot in our field of vision. Close one of your eyes, take finger around 20cm away from opened eye and move it left and right while looking at the same spot in front of you(so only finger moves).
At one point the tip of the finger disappears. And that spot doesn’t become black. It just disappears.
That is the same with blind. You have no sensation at all. It simply doesn’t exist. No black. Nothing.
Take a finger, move it to the edge of your vision. Now, keep moving it until you can no longer see it. It’s not “black,” it’s not there. Now imagine that for everything.
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