UV rays are a type of radiation emitted by the sun. The effects of UV rays on the eyes can lead to cataracts and even sight loss in the long run. That’s why it’s very important to wear sunglasses with UV protection when it’s sunny out, in order to protect your eyes.
Less commonly mentioned are reflected UV rays which can be at their highest levels in water and snow. Those who regularly partake in activities in snow or on water are encouraged to wear sports sunglasses or snow googles.