UV protection is a must-have for sunglasses, since the sun's UV rays can cause permanent damage to your eyes. Sunglasses should block UV wavelengths up to 400 nanometers and protect against both UVA and UVB. Don't be fooled by dark or mirrored lenses—they don't always block UV rays. Dark lenses without UV protection are even worse than not wearing sunglasses at all. This is because low light will cause your pupils to get bigger, which lets more UV rays into your eyes.
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