In the previous article, we discussed “How much do sunglasses cost?”. In this article, let’s talk about “How Sunglasses Protect Your Eyes”.
Diminish The Light
Sunglasses can not only prevent uncomfortable strong light but also protect eyes from ultraviolet rays. All of this contributes to the metal powder filter device, which will work when the light goes through it. Colored glasses can selectively absorb some of the wavelengths of the sunlight with the help of very fine metal powders (iron, copper, nickel, etc.). In fact, when the light goes through the lenses, the light is reduced based on the so-called 'destructive interference' process. In other words, when certain wavelengths (UVA, UVB, and sometimes infrared) go through the lenses, they will cancel each other out on the inside of the lenses. The overlapping of light waves is not accidental. They will cancel each other at that time when the peaks of one wave are combined with the troughs of the adjacent waves. The phenomenon of destructive interference depends on the refractive index of the lenses that is, the degree of deviation when light passes through different substances in the air. And it also depends on the thickness of the lens. Generally speaking, the thickness of the lens is different, and the refractive index of the lens varies according to the difference in chemical composition.
Sunglasses have the best prevention against ultraviolet rays. The dazzling light will bring damage to your eyes. And some people will have a headache with the dazzling light. Nevertheless, Sunglasses have a filtering effect of 95-0. And that sunglasses can reduce the damage of strong sunlight to the eyes.
Most people still choose sunglasses in accordance with the beautiful look. They think sunglasses are modern fashion accessories. Therefore, the appearance of the glasses is the first consideration when buying sunglasses. Now, clothing stores also will provide a lot of sunglasses for people to match clothing. Although sunglasses have the function of decoration, we can not ignore the importance of their protective function. If there is no proper prevention of ultraviolet rays, it will also do harm to the eyes when wearing them for a long time.
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