ANTI BLUE LIGHT--Anti harmful blue ray, provide all-day protection, against the detrimental effect high energy visible blue light and UV400. REDUCE EYESTRAIN--Enjoy your digital time, NO worry about eye fatigue, blurred vision and headache. SLEEP BETTER--Better sleep for you, blue blocker for your eyes and guardian for your health. TRANSPARENT LENS--No color difference, bring you good visual experience. LIFETIME WARRANTY--We provide worry-free lifetime warranty(no man-made)and friendly customer service.