It is advisable to choose ski glasses that filter the light depending on the time of day you are skiing. Lenses offer endless opportunities for all weather conditions . A low number (less than 15) protects us from light on sunny days. Conversely, 70% means better perception and depth on low light days. The lens colour also plays an important role. In low light and fog, the yellowish lenses filter out blue light. For bright light, dark shades such as brown or grey are ideal. In addition, if skiing at sunset or at night, clear lenses are recommended as they have almost absolute visible light transmission. This allows the maximum amount of light to enter.