Cyxus Blue Light Filter Computer Glasses, Better Sleep Anti Eyestrain Headache Classic Eyewear Oval Frame (Yellow lens black frame) Plastic ANTI BLUE LIGHT - Cyxus glasses can cut 90% of the blue light.Reduce eyestrain and headache.Give you a better sleeping. BETTER SLEEP - Cyxus reading glasses can reduce eyestrain and headache, so you can enjoy a restful deeper sleep. FDA REGISTERED COMPANY- Cyxus is the professional eye protection glasses brand in USA with the FDA certification,CE certification and RoHS certification. LIFETIME WARRANTY - You can return the defective products for repairing or exchanging for free at any time (if not man-made damage). SELL OVER THE WORLD - All Our products are sold in the USA,Canada,Europe,South America,Oceania,Asia and Africa.