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# physics fact about wearing sunglasses when under the sun

Wearing sunglasses that do not block ultraviolet (UV) light is worse for your eyes than wearing sunglasses at all. The lenses of any sunglasses absorb some visible light, thereby causing the wearer's pupils to dilate. If the glasses do not also block UV light, more damage may be done to the lens of the eyes because of the dilated pupils. If you wear no sunglasses at all, your pupils are contracted, you squint, and much less UV light enters your eyes. High-quality sunglasses block nearly all the eye-damaging UV light

Note by Jaber Al-arbash
3 years, 2 months ago

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