Would life be significantly different if no light were detectable when closing our eyes?
Currently, if your eyes are closed you can still get a sense of the light around you, and moving your head around you can tell if you're moving it toward or away from a light source (barring maybe if you're outdoors and it's bright out all around you).
But what if when we closed our eyes it was like full blackout? Would blinking become disorienting? Could it mess up circadian rhythms? Something else? Or would it not really matter?
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You can see your nose at all times, as it is within your field of vision at all times - but your brain filters it out, so what you actually "see" is a nose-free impression of your surroundings. It works like a movie editor that removes unwanted parts from raw footage before the movie is actually shown to the public.
If blinking were a total blackout for a fraction of a second, I'd wager the human brain would have developed a workaround to delete that / filter it out as well, so you wouldn't even notice a difference.
yeah, i wish.
I was gifted a big fat bulbous beak from my parents, it's half my vision!
I've got a narrow nose, and I still notice it all the time.
Already does. Persistence of vision. It's why some seconds seem longer when you look at a clock suddenly. Your brain fills in the missing "frames" with what it thinks should be there.