How come when you close both eyes you see black but when you close one eye you just see nothing?

Question

Why don’t you see black on that one eye when you close it?

In: Biology

Answer 1

The same way it’s hard to see the rest of the sky when you stare at the sun.

You can see the black with one eye shut, but because there’s light entering your open eye it grabs most of your attention and focus. You can see the black of the closed eye if you try.