Why should wear sunglass when skiing? If you don’t wear sunglass to protect your eye, you probably got snow blindness. The sunglass do not only provide fashion looking, but also give you the protection from ultraviolet irradiation. Ultraviolet irradiation, even in moderate will cause a painful superficial keratitis that begins 6-12 hours after exposure. So if you like skiing, choose a lovely sunglass or a professional sunglass style to protect your cornea and macula from keratitis and macular age related degeneration.