Sometimes when people wear sunglasses indoors I can see their eyes but when they wear them outdoors in bright sunlight, I can't see their eyes at all. Shouldn't it be the other way around? Or do sunglasses have something that makes them darken when exposed to sunlight? I know some glasses have lenses that react to UV light but I'm just wondering about sunglasses in general. Thanks
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Do sunglasses get darker in sunlight?