The blue light wavelength is 415-455nm and the blue light band in the spectrum is 380nm ~ 500nm. The anti blue intelligent photochromic  lens adopts advanced technology and adds special anti blue light chemical substance to effectively block the strong blue light part of 380nm ~ 430nm by more than 90% and  remain weak blue light part to pass through, so as to keep the physiological needs of human body! 

Anti-Blue Ray Photochromic Lens is with light transmittance of 92%. In the case of insufficient light, it can still have a good visual sight! Its color change effect is added by silver chloride or other halides added to the lens. Such substances are transparent to visible light when they are not exposed to ultraviolet light. When they are irradiated by ultraviolet light, they will react chemically. After chemical reaction, they will absorb some visible light and make the lens appear dark!