Product description 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 BB60 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. √ Convenient set of 12 reading glasses. Keep a pair at home, office, in your car and your favorite reading spots. 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. 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 Eyekepper Cut 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 Eyekepper 12-Pack Vintage Blue Light Blocking Reading Glasses for Men Women R... Eyekepper 12-Pack Blue Light Blocking Reading Glasses for Women Half Moon Com... Eyekepper 12-Pack Oversized Blue Light Blocking Reading Glasses for Women Com... Eyekepper 12-Pack Panthos Frame Blue Light Blocking Reading Glasses for Women... Eyekepper 12 pack Blue Light Blocking Reading Glasses Square Computer Readers... Buying Options Buying Options Buying Options Buying Options Buying Options Customer Reviews 1 1 1 1 189 Spring Hinge ✓ ✓ ✓ ✓ ✓ Anti-UV UV400 UV 400 UV 400 UV 400 UV 400 Item Shape Round Cat Eye butterfly Pathos Pathos Quantites 12 12 12 12 12