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-500nmUse to test wavelength is 450nmThe 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. Color Distortion Almost no color difference.The premium features of EYEKEPPER lenses, make screen time more comfortable and help eliminate symptoms of digital eyestrain. Spectrum Analyzer Amber Tinted with 12 Layer Coating of EyekepperCut 100% of UV420,UVA and UVB Protect our eyes Tinted lenses - great for outdoor reading. Whether you are looking for reading glasses for the office or home. Our reading glasses will give you the premium protection you are looking for