143Photochromic lenses are adaptive lenses that quickly react to exposure to direct sunlight. Lenses darken when exposed to light of sufficiently high frequency, most commonly UV light. They return to their clear state when the activating light is absent. These lenses are excellent for bikers and ru-nners, who often find themselves at the mercy of changing light conditions.Photochromic lenses
元のページ ../index.html#143