The first version of "sunglasses" were circles with slits in them

The first version of "sunglasses" were circles with slits in them
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In prehistoric and historic time, Inuit peoples wore flattened walrus ivory "glasses," looking through narrow slits to block harmful reflected rays of the sun.[3] Don't forget to check out our Kickstarter Campaign! If you love Curionic pledge what you can! Even a dollar and a share helps!

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