The color-changing lens is based on the principle of the reversible reaction between light and color. The lens can quickly darken under the irradiation of light and ultraviolet rays, block strong light and absorb ultraviolet rays, and have a neutral absorption of visible light; back to the dark place, it can quickly restore the colorless and transparent state , To ensure the transmittance of the lens. Therefore, the color-changing lens is suitable for indoor and outdoor use to prevent the sun, ultraviolet light, and glare from harming the eyes. So do you know what its knowledge of choice is? Let's follow the editor of Single vision photochromic lens to have a simple understanding!

1. Yellow lens: can absorb 100% of ultraviolet rays, and can let infrared and 83% of visible light penetrate the lens. The characteristic of the yellow lens is that it absorbs most of the blue light. Because when the sun shines through the atmosphere, it is mainly represented by blue light (this can explain why the sky is blue). After the yellow lens absorbs the blue light, it can make the natural scene more clear. Therefore, the yellow lens is often used as a filter or used by hunters when hunting. Strictly speaking, this type of lens is not a sunglass lens, because it hardly reduces visible light, but in foggy and twilight hours, yellow lenses can improve the contrast and provide more accurate vision, so it is also called night vision goggles. Some young people wear "sunglasses" with yellow lenses as decoration, which is an option for those with glaucoma and those who need to improve their visual brightness.
2. Green lens: The green lens, like the gray lens, can effectively absorb infrared light and 99% of ultraviolet light. While absorbing light, it greatly increases the green light reaching the eyes, so it has a cool and comfortable feeling, suitable for people who are prone to eye fatigue.
3. Light blue lenses: Sun blue lenses can be worn when playing on the beach. Blue can effectively filter out the light blue reflected by the sea and sky. We should avoid using blue lenses when driving, because it will make us unable to distinguish the color of the traffic signal.
The above is the story of Single vision photochromic lens editor: the selection of color-changing lens, I hope you can learn more.