Flat glasses are also called flat mirrors, which can be divided into light white mirrors, color-changing mirrors, coated mirrors, crystal mirrors, Kesi mirrors and Kesai mirrors. Its optical performance is related to the quality of the lens, that is, the higher the quality, the stronger the transparency and the better the effect of protecting the eyes. So what is the function of flat glasses? What kind of glasses are called flat glasses, let's take a look at it together. Flat glasses are different from ordinary optical glasses. They cannot protect eyes from myopia and have no effect on correcting vision. But flat glasses, like ordinary sunglasses, can effectively block ultraviolet rays from harming the health of the eyes. At the same time, they also have the function of absorbing infrared rays. They are also good at preventing glare and wind and sand. Some flat glasses with chemical ingredients will also have lenses of different colors, and they also have the effect of preventing radiation. However, there are many counterfeit products of flat glasses, so everyone should pay attention to distinguish them when buying. The following editor will introduce several ways to identify flat glasses. <1>. First identify the level of surface finish: You can place the product under a 60-watt incandescent lamp to observe. If there are scratches, pitting, chipping, sand holes, water ripples, bubbles and other surface defects, they are generally Inferior product. <2>. Either put the glasses 33 cm away from the eyes, and when looking through the glasses, if there is a phenomenon that they become larger or smaller, it means that the quality of the glasses is defective. <3>. The latter method is also a simpler method. Check whether the trademark, manufacturer, and quality certificate are authentic and reliable. Generally, regular products will be engraved with the manufacturer’s trademark, and you can carefully observe the edge of the lens. Find. Although flat glasses cannot prevent myopia, they can block ultraviolet radiation and add a layer of protection to the eyes. At the same time, it can also absorb infrared rays and reflect all kinds of strong light. It protects the eyes from the influence of external light all-weather, and protects the health of the eyes to a greater extent.