420. √Transparent lens, the lens was made of a fully transparent base, without adding any pigment, while maintaining high light transmittance. less reflective, no affect reading, and almost no color difference, which can be perfectly used as computer glasses √Stylish frame, give men and women an elegant fit √Replaceable lenses -The original non-prescription lenses can be replaced with progressive/prescription lenses at your neighborhood reading glasses place. √Premium Lens Coating – UV Light Blocking (100% Blocking UVA&100% Blocking UVB)Anti-Scratch Anti-Reflective Anti-Glare Anti-Dust Anti-Oil(Fingerprint Resistant) Electromagnetic Ray Blocking Blue Blocker Lens: lens can block harmful blue light, release your eye fatigue when watching TV and looking at computer. And provide you 100%UV400 protection. Reduce Eyestrain and Enjoy Better Sleep: no more eye fatigue, blurred vision and headache during your computer/ ipad/ tablet/ iphone screen time. Better sleep for you, blue light blocker is there for your eyes and guardian for your exquisite life. Transparent Lens(Not Tinted Yellow Lens): give you a clear vision when play computer and laptop. [Packing list]: 1* eyeglasses; 1* soft clean cloth; 1* blue light blocking test tools. [Lifetime Warranty]: you can return the defective products for repairing or exchanging for free at any time without any question. [Kindly Notice]:not including man-made damage. Blue Light Blocking Glasses: Improving Your Digital Life √Blue light blocking glasses lens applies the cutting-edge U.S. HEV-Adsorb substrate absorption technology. It can absorb and cut 39% of harmful high-energy blue light. √UV light prevention, Anti-blue-ray lens utilizes special U.S. substrate processing technology to protect the eyes from ultraviolet radiation and block UV light