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Snow goggles are sometimes used to protect against photokeratitis (a.k.a. snow blindness). How good are snow goggles for UV protection? E.g., do they block 99 to 100 percent of both UVA and UVB rays, like decent sunglasses do? Or are they pretty much useless for UV protection?

Examples of snow goggles:

https://youtu.be/6pFWwL7tZvE?t=3m59s :

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https://en.wikipedia.org/wiki/Snow_goggles :

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