Choose the right color
It is equally important to choose the right color for the sunglasses lens. Lenses are graded according to degree of protection and category. In winter, yellow, green and blue lenses are not recommended. They can only provide protection of level 0, 1 or 2, or belong to the S0, S1 or S2 category. Gray and brown lenses are recommended for winter. They should belong to level 3 protection or category S3, they can provide adequate protection even in the presence of snow and ice on high mountains. For extremely sensitive eyes, lenses with degree of protection 4 or category S4 can be used. However, this type of spectacle lens is only necessary if the UV radiation is very high; it cannot be used while driving.
Blue light blocking
A good pair of sunglasses should also provide adequate levels of Blue-ray protection. This is because blue light can damage the macula, which is a very sensitive point in the eye. If you already have a pair of sunglasses and you are not sure how much blue light you can block, you can ask the optometrist to test it for you.
Additional tips for winter sports: If you wear eyeglasses, you should make ski goggles specifically for your own optometry, or buy large enough ski goggles to wear your own eyeglasses under the goggles. Some ski goggles have a foam stand, which is very beneficial for the wearer of the eyeglasses, with extra space on the side to adjust the spectacle frame. These factors provide good fit so that there is no pressure on the glasses under the ski goggles. The side of the ski goggles should be sealed to prevent airflow through.