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.
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