Why we need filter blue light ? In life- the sun and the electronic screen will produce blue light.Blue light has a short wavelength of 400-440 nanometers can penetrate the lens of the eye directly to the macular area of the eye- leading to macular lesions and consquently visual impairment.Long exposure to blue light can lead to dry eyes-headaches and depression. Blue light blocking glasses will reduce harmful blue light more than 90%.Thus it can prevent dry eyes- headaches- visual impairment- insomnia and other effects caused by long-term without the protection of glasses. What Makes BOVC Blue Blocker Glasses Unique? blue light blocking lens are made of resin material and coated with yellow-green-blue film. It can absorb and cut the harmful high-energy blue light. UV light prevention- Anti-blue-ray lens utilizes special U.S. substrate processing technology to protect the eyes from ultraviolet radiation and block UV light. Transparent lens- the lens was made of a fully transparent base-while maintaining high light transmittance. less reflective- no affect reading- and almost no color difference- which can be perfectly used as computer glasses Stylish and super lightweight frame- give men- women and kids an elegant fit Premium Lens Coating – UV Light Blocking (100% Blocking UVA&100% Blocking UVB) –Anti-Scratch –Anti-Reflective –Anti-Glare –Anti-Dust –Anti-Oil(Fingerprint Resistant) –Electromagnetic Ray Blocking