TIJN Blue Light Block Glasses|Round Optical Eyewear Non-prescription Eyeglasses Frame for Women metal frame Composite lens non-polarized Lens width: 52 millimeters IMPROVED LENS--Our improved blue light blocking lens has no color difference, can bring you a better visual experience. 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 CHIC OVERSIZE DESIGN-A refined luxe accent round,fusing together vintage and contemporary styles You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it! Too much blue light exposure will cause eye strain, blurred vision, and headaches. According to recent studies, too much blue light exposure can even lead to permanent eye damage and vision loss. Now that we are using more digital devices at home and work, its important to protect our eyes as much as possible. Injury the structure of macular, will cause eye strain and blurred vision, even lead to permanent eye damage and vision loss. Cause visual fatigue, affect your learning and working efficiency Cause poor sleeping quality or even hardly can fall asleep