Sports Frame is Lightweight But, for Safety Eyeglasses with Wraparound Design that Provides Increased Side Protection and Peripheral Vision UV400 rated sunglasses are essential for filtering out sunlight reflected glare and protecting your eyes against long term UV damage when you go out. Sun Photohromic and Reading Lens: Photochromic Glasses Not Only Have All The Functions Of Reading Glasses, But Also The Lenses Can Change Color In The Sun And Can Be Used As Sunglasses, This is Great Value Multifunctional Glasses. Note: This is not sunglasses! ! The photochromic lens changes according to the intensity of ultraviolet rays. The stronger the ultraviolet rays, the deeper the discoloration, and the weaker the ultraviolet rays, the lighter the discoloration. (We will check carefully before leaving the warehouse). SUITABLE - Suitable for reading,walking or other outdoor. it a wonderful gift for friends and family Photochromic glasses have lenses that change tint depending on the weather or surroundings. The benefit of photochromic lenses is that in dull, overcast weather or darker surroundings (like running or cycling through woods or early / late in the day) they will lighten. But in bright, sunny conditions they will go dark. Photochromic lenses are most popular with cyclists, runners, skiers, tennis and outdoor reading enthusiasts.