8 tips for choosing sunglasses
We can't see ultraviolet light, but at least now we know it's there, and we know that we should protect ourselves from it. Up until the 1930s, sunglasses weren't widely available. Protecting our eyes from the sun meant wearing a wide-brimmed hat. Nowadays, we know that ultraviolet (UV) radiation can lead to serious eye damage, including cataracts, cancer, snow blindness, and more commonly, photokeratitis, which amounts to an eye sunburn. Ouch.
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