What is photochromic lens? Photochromic lenses are based on the intensity of sunlight and ultraviolet lights, darkening the light grey lens.suffering the stronger sunlight and ultraviolet lights, the glassess lense will be black; In cloudy day, it changes into gray; At room or night, it's transparent. The advantage of a photochromic lens is that you can wear your eyewear all day and can change your lenses color according to the intensity of sunlight and ultraviolet lights. It is the choice for driving, enhance you and your loved one's safety when driving. HD Polarized Lens: 100% UV400 protection lens blocks 100% Harmful UVA, UVB & UVC Rays. UV protection polarized sunglasses for Men! Multifunctional Sports Sunglasses: Ideal for Driving, Running, Fishing, Racing, Skiing, Climbing, Hunting,Trekking, Cycling Bicycle, Motorcycling and other outdoor activities.. Why choose photochromic polarized sunglasses? Photochromic lenses automatically adapt to light,the glasses can protect eyes without interfering with your perception of colour，provide you the best level of vision，making your eyes more comfortable and you can see better.whilst regular sunglasses remain at the same level of tint, they may be too dark in some situations,affect the line of sight. When driving at dusk or into a dark environment, the lenses are clear color and higher transmittance, enhance the visibility,restoring true colors while effectively reducing the glare. During the daytime outdoor under strong UV conditions , it can effectively filter the strong light, enhance the visual sharpness, reduce eyes fatigue, and keep the eyes always in the most comfortable state of outdoor activities. Some customers say that the lens are not working, what is the situation? We really understand your question, everyone's habits are different. Therefore, products do not work the same way in different environments. These sunglasses are made of translucent lenses with photochromic. The glasses remain translucent when used night and indoors. When glasses are used outdoors, they block and absorb harmful UV rays. When the glasses absorb UV light, a black protective layer is formed on the outermost layer of the glasses, changing the color of the lenses. Therefore, the glasses do not trigger their protective mechanisms when UV light is weak or absent. NOTE： Some customers say the glasses don't work when driving, It's because some windshields have UV protection, which blocks the sun's UV rays, so the glasses don't change color. Package Included Polarized Photochromic Sunglasses*1 EVA Glasses Case*1 Sports glasses rope*1 Soft Glasses Cloth*1 Soft Glasses pouch*1 Polarized test card*1 UV TESTER TEST 100% UV400 protection coating, blocks 100% harmful UVA & UVB Rays High-grade lens: anti-UVA, UVB, anti-ultraviolet, strong light, glare with light weight and impact resistance The frame design: the stylish individuality of the empty decorative design, simple carving, luxurious and elegant, let you stand out from the crowd Delicate hinges: high-end TAC school chain, safe and secure, scalable and solid to defend your trend Photochromic Sunglasses Photochromic Sunglasses Photochromic Sunglasses Photochromic Sunglasses camo sunglasses Photochromic Cycling Sunglasses Add to Cart Add to Cart Buying Options Buying Options Buying Options Buying Options Customer Reviews 3.7 out of 5 stars 234 3.9 out of 5 stars 291 3.8 out of 5 stars 27 3.3 out of 5 stars 65 4.4 out of 5 stars 217 5.0 out of 5 stars 6 Price $16.89$16.89 $16.89$16.89 — no data — no data — no data — no data 400UV ✓ ✓ ✓ ✓ ✓ ✓ Polarized ✓ ✓ ✓ ✓ ✓ ✓ Photochromic ✓ ✓ ✓ ✓ no data ✓ Material Frame: PC | Lens: TAC Frame: PC | Lens: TAC Frame: PC | Lens: TAC Frame: PC | Lens: TAC Frame: PC | Lens: TAC Frame: PC | Lens: TAC