Solar lenses can block uncomfortable strong light and protect eyes from ultraviolet rays. All this is due to metal powder filtration devices, which can "select" light when it enters. Colored glasses can selectively absorb part of the wavelength band that makes up the sun's light because they use very fine metal powder.
In fact, when light hits the lens, the light is reduced based on the so-called "destructive interference" process. In other words, when some wavelengths of light pass through the lens, they will cancel each other on the inside of the lens, that is, in the direction of the eye. The overlapping of light waves is not accidental: the combination of the peaks of a wave and the troughs of its adjacent waves leads to mutual cancellation. The phenomenon of destructive interference depends on the refractive index of the lens and the thickness of the lens. Generally speaking, the thickness of the lens changes little, while the refractive index of the lens varies according to the difference of chemical composition.
Ophthalmologists point out that there is one color that is most UV resistant, not black as you usually think, but yellow! If you only plan to buy a pair of sunglasses, then the yellow lens will be the safest choice. It can provide all-round UV protection. If you have 3 pairs of sunglasses with different lens colors on average, just like different perfume for different occasions, the lenses with different colors also have the best matching environment.
1、 Pink lens, filtering 95% UV - confidence enhancer
Pink lens sunglasses can filter 95% of ultraviolet light and some visible light with short wavelength. In fact, pink lenses are similar to ordinary uncolored lenses and have no better protective effect than ordinary lenses. But psychological research has found that 65% of women have more than 10% higher confidence than usual after wearing pink sunglasses. Pink sunglasses are self-confidence enhancers that can be worn on rainy days when you are depressed or have weak ultraviolet rays.
2、 Green lens, filtering 99% UV - soothing sedative
Fashionable green lenses, like gray lenses, can filter infrared light and 99% ultraviolet light. However, green lenses will change the color of some scenes, and the effect of blocking light is slightly inferior to gray lenses. Fortunately, green is a natural sedative, which can make people around feel comfortable.
3、 Yellow lens, filtering 100% UV - shenqingmu brightener
Yellow lens sunglasses can filter 100% ultraviolet light, allowing infrared and 83% visible light to penetrate the lens. Its characteristic is that it can filter most of the blue light dazzling in the sun. When sunlight passes through the atmosphere, it mostly appears as blue light, which is why we see that the sky is blue. After the yellow lens filters the blue light, the natural scenery can be seen more clearly. Therefore, wearing yellow sunglasses when driving can see the traffic more clearly.