EYEKEPPER, a brand of professional, affordable blue light blocking glasses that aims to help you reduce eye strain to see the digital screen. Get unique computer glasses from EYEKEPPER and enjoy the reading of eyesight benefits and stylish features. Per the Occupational Safety & Health Administration: The preferred viewing distance for VDTs ranges between 18 and 24 inches (45.72 and 60.96 centimeters, respectively) Filters 100% of the most damaging low-level blue and nearly 90% high energy visible light from tablets, phones, TV, computers and more. Our lenses code is BB40 for the EYEKEPPER blue light block glasses. WHY CHOOSE EYEKEPPER ? √ More professional blue ray blocking -- Glasses lens are designed using the American HEV-Adsorb substrate absorption technology.It can absorb high-energy blue light. √ Stronger UV protection -- Anti-Blu-ray Lenses utilize special U.S. substrate processing technology to protect the eyes from ultraviolet radiation and block UV420 not just UV400. WE ARE DIFFERENT! Data for Eyekepper's BB40 40% blue light blocking for wavelength 395nm-500nm Use to test wavelength is 450nm The data of left is visiable light,the data of middle is blue light remaining,the data of right is UV light remaining. EYEKEPPER glasses are specially designed to filter out a portion of harmful blue light. Anti Eye Fatigue Reduce eye strain and sensitivity to light while facing digital screens for a long time. After wearing our blue light blocking glasses, you would get a better sleep. Spectrum Analyzer Amber Tinted with 12 Layer Coating of Eyekepper. Cut 100% of UV420, UVA and UVB Protect Your Eyes Prolonged exposure to blue light will cause eye fatigue, blurred vision and headache. Eyekepper reading glasses will block the most harmful blue light from your computer, phone and TV. Read more