First let's review the physical characteristics of light. The omnipresent light, when entering from one medium to another, will produce physical phenomena of refraction and reflection. When light enters from medium A to medium B, some of the light will return to medium A. The light returning to the A medium is called reflected light; the rest of the light changes the speed and direction of the light when it passes through. This type of light is called refracted light which enters the eyeball.
Sunlight is white light that is a mixture of red, blue, and green light. Different light is separated through the triangular prism. When it comes in contact with the lens, it absorbs light of a certain wavelength according to the color of the lens. Only certain wavelengths are allowed passing through, such as anti-blue light lens, absorbs blue wavelength light when the light passes, causing the lens to look yellow. The same principle applies to anti-blue screen protector for mobile phone or tablet. If the light hits an opaque object, some color wavelengths will be absorbed by the surface of the object and reflect light of other colors, which is why the reflected light will have a color.
The original idea of revo coating is provided by NASA's technical principles. At the beginning, NASA was designed to give high contrast to the sun visor lenses on space suits, and then extend to sunglasses lenses. Inorganic chemistry principle materials with different refractive indexes interfere with each other. The visible light wavelength structure is designed to block specific wavelengths, provide good protection and use the principle of night vision goggles to see the same field of view during the day or night. A complete multi-layer coating requires 9-11 layers of coating processes to make the lens color richer and saturated. The coating of different colors will bring different functionalities to the glasses. According to different colors of the use environment, choose a suitable coating color, such as blue revo, will cause a large amount of refraction of the blue light wavelength, reducing the impact of blue light on the sight. Then increase the blue contrast and vividness, which is very suitable for water sports, observing the condition of the water surface and the current, so that you can know the safety of the underwater before entering the water. The biggest advantage of revo coating is that it provides the same visual effect whether it is worn day or night.
About the photochoromic which is color-changing lens. The lens changes the molecular structure of the lens with ultraviolet light, which affects the color change of the lens. When the light encounters the color-coated and color-changing lens, except for the original factor of the color-changing lens, the light transmittance will be between Cat.0-Cat.3. More flexible under any situation. If there is no revo coating, the reflected light we see will be invisible light. Conversely, if the lens is yellow revo or green revo, we will see the reflected light with colors. It can be used as a basis for measuring the strength of ultraviolet rays. When the color of the lens is getting darker or the color on the coating is getting darker, the color of the reflected light will be getting darker. At that time, you should put on sunglasses to protect your eyes as soon as possible..