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
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.
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