Photochromic technology darkens the lens automatically to help you adapt to changing light. Distortion Free Lenses: Keep text sharp, even in your peripheral vision. Scratch Resistant: the multi-layer coating is combined into a single layer with a thickness of only 10um, which increases the surface hardness of the lens, prevent scratches. Warranty: We focus on the product quality, any problem for this product, just contact the seller without any hesitation and we will provide you the best service! Item shape: Rectangular Department name: mens Men Auto Gray Nerd Geek Reading Glass UV400 Sunglass