UV radiation is present throughout the year, on sunny days and cloudy ones, too. Further, elements such as water, grass, concrete and snow can powerfully reflect UV light, which can be virtually as harmful as direct UV, the researchers said."Many consumers purchase sunglasses based on style and comfort, but when choosing a pair of sunglasses, it's vital to check the label to make sure lenses are UVA/UVB protective," added Mike Daley, CEO of The Vision Council.