You would think that you’d see a vantablack sort of shade or the darkest black in existence, but in total darkness, why do you see this dark gray color that isn’t quite black?
Try it. Go to a pitch-black room and open your eyes.
In: Biology
That’s not completely clear. There best guess is linking eigengrau to what amounts to misfiring or just random triggering of visual events. Contrast is also a factor which is of major importance to perceived brightness.
Remember that evolutionarily, there is no adaptive pressure for eyes to work flawlessly in pitch darkness (and thusly show you true absolute darkness).
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