Even if there is a bit of light coming in, after couple seconds it’s complete darkness until I move my eyes
In: Biology
When the eyes continue to send the same data to your brain they get ignored. Your brain actually does this with a lot of things, like smell. You know when you dont smell something because its been in your house for so long but visitors mention something? Its just like that, but with your eyes.
I’m not an expert but I remember from a sensation and perception class in Uni that It’s because your eye has rods and cones. Cones work best in light and allow you to see colours and details. They are concentrated around your optic nerve on the retina. Rods are for low lights situations and are scattered further away from the optic nerve so light coming in to the eye will hit it at a shallower angle. If you want to see more stars on a dark night, look slightly away. If you want to see anything in low light better just avert your eyes slightly and it will become clearer.
I don’t know about everything being black, because the eyes are supposed to jiggle back and forth to prevent the comment above from happening.
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