Somehow noone has mentioned a very important issue yet.
Your eyes accommodate to darkness by widening the pupil, allowing more of the sparse light to enter the eye. That why the first light when you wake up on a winter morning can be quite unbearable.
Same things happends during a solar eclipse, as light fades, the pupils dilate. When the sun re-emerges, it happends quite fast, faster than the pupils can contract, making your eyes way more vulnerable to damage from the sun that they’d otherwise be.
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