This magical photochromic lens are based on the intensity of sunlight and ultraviolet light, darkening the light grey lens. What’s more, these glasses protect the eyes without interfering with your perception of color. Plus its fashion Square design, always match your daily dressing demand(may not change obviously under weak UV lights) cycling,driving,running,fishing,climbing,trekking or other outdoor activities enthusiasts. stylish design,with rich color combinations of frames and lens. Polycarbonate lens and frames are impact,scratch resistant,durable and unbreakable. Photochromic lenses are transformed from indoor reading glasses to outdoor reading glasses. They can also be used as ordinary photochromic sunglasses with UV protection. They are an excellent solution for people who hate constantly switching between their reading glasses and their shades Sports Frame is Lightweight But, for Safety Eyeglasses with Wraparound Design that Provides Increased Side Protection and Peripheral Vision Lightweight frame with photochromic lenses easy reading indoor and outdoor. 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) Unisex Sports of Style Sunglasses Readers Outdoor Reading Glasses 1.50- Not Bifocals Presbyopic Glasses square Photochromic Gray Sunglasses for Men Women Readers Tinted Outdoor Reading Glasses for Work - Magnifying Readers