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No matter the season, if you're outside you should be wearing sunglasses. Exposure to UV rays in the winter can harm your eyes just as much as they can in the heat of the summer.
Sunglasses are especially important if you are outside participating in winter sports. Because mountains are high up from sea-level, there is less filtration of radiation and you may not feel the sun's heat. Snow has a reflective quality to it, and up to 85% of the sun's UV radiation may be reflected upward, making the sun even more dangerous. Also, if you are skiing or snowboarding, the sun's reflection on the snow will make it difficult for you to see and could cause accidents.
In addition, you should wear sunglasses or goggles for winter activities to prevent debris and snow from blowing in your eyes. UV rays can cause sunburned eyes (also called snow blindness) and can damage your cornea.
Even if the weather is overcast and cloudy, be sure to wear sunglasses or goggles for all of your winter activities.