The innovative Blue Natural lenses act as a protective filter for the eye, and absorb these potentially harmful light radiations. They protect the eye completely, blocking UV rays and high-energy blue light up to 420 nm, while allowing for normal colour perception. The latest generation BLUE NATURAL lens is a protective filter able to absorb all the light radiations potentially harmful to the human eye. Part of the light of the "first visible", in particular the blue light (400-540 nm), presents characteristics of high energies that can be harmful to the eye such as UV rays. The BLUE NATURAL lens completely shields against light radiation up to 420 nm, blocking UV rays and the part of high-energy blue light, allowing the part of blue light to pass through the normal color perception. The BLUE NATURAL lens is suitable for those who want the highest visual protection in any environment. The harmful effects of blue light: Red and irritated eyes Ocular dryness Blurred vision Feeling of light annoyance Emergence of eye diseases such as keratitis, etc