Blockage absorbs up to 420 nm of the blue-violet light wavelength emitted from daylight, all digital devices using LEDs and lighting fixtures, which is the most damaging to the eye. The blockade prevents the harmful wavelength of blue light, which it absorbs and filters due to the material property, from reaching the eye.The blockade prevents the harmful wavelength of blue light, which it absorbs and filters due to the material property, from reaching the eye.
Blue light is a light that is very close to ultraviolet light.Blue light is a light that is very close to ultraviolet light. However, ultraviolet light is a light that cannot be seen, while blue light is the light that can be seen. Since the frequency of blue light is close to UV, it contains high energy and is almost never filtered when passing through the eye and reaching the retina. Not only from solar heating, but also from devices that emit electro-magnetic radiation, such as computers, tablets, phones, TVs, led, xenon, fluorescent and saving light bulbs, etc. filters the harmful blue light wavelength that reaches the eye from artificial light sources with the absorption function. The wavelength of the most harmful part of blue light is about 420 nanometers. it is known that blue light in the range of 400 nanometers and 440 nanometers also causes retinal damage, macular degeneration (yellow spot) in the human eye, just like ultraviolet light.