u003cbru003eAlthough there are many brands of domestic glasses
, there are very few brands that consumers can be well-known. In contrast, although many consumers do not choose imported sunglasses, they still know a little about some well-known brands, but not many people know about many domestic brands. Many consumers don't pay much attention to the brand when buying sunglasses, they just buy them when they think they are suitable for them, and the cost is generally not high. Domestic sunglasses do not pay much attention to their own propaganda. Although some of them are made of the same material, the big brands can charge a few thousand yuan, while the domestic ones are generally only a few hundred yuan. Moreover, domestic brands did not put much effort in designing, they were more imitating, without injecting their own individual elements. As a result, many consumers who pay attention to brand and quality choose more internationally renowned brands. So how do we choose sunglasses? Choose according to the anti-ultraviolet logo of sunglasses: the main function of sunglasses is to prevent glare and string light, especially ultraviolet radiation, to protect the health of the eyes in summer. Therefore, to put it simply, you must pay attention to whether there are 'UV400' and 'UV protection' signs and logos on the lenses and packaging. According to the requirements of QB2457-1999 for the logo, each pair of glasses should be marked with the implemented standard code (QB2457, etc.), category (shading glasses or light-colored sunglasses, etc.), and the name and trademark of the manufacturer. The indication of the category allows consumers to choose the sunglasses elbow according to the purpose and the correct purchase. A pair of sunglasses that meets my country’s current standards does not necessarily have additional protective properties such as anti-ultraviolet or impact resistance. These indicators will be evaluated only when the product has an express performance: 1. Marking ultraviolet rays related to the anti-ultraviolet function Refers to solar rays with a wavelength of 100 nm to 380 nm, including three types: UVA band is 315 nm-380 nm, UVB band is 280 nm to 315 nm, and UVC band is 100 nm to 280 nm. The ultraviolet rays (290 nm～2000nm) that reach the surface of the earth account for about 13%, of which UVA accounts for 97%, UVB accounts for 3%, and UVC is close to O. The damage of ultraviolet rays to the human eye is mainly determined by the wavelength, radiation time and intensity of the ultraviolet rays and the strength of the human eye’s own defense mechanism. The cornea and lens are the ocular tissues that are often damaged by ultraviolet rays. Solar keratitis and corneal endothelial damage. Solar cataract is an eye disease related to it. In order to protect the health of the eyes, you can choose sunglasses with anti-ultraviolet function to eliminate ultraviolet rays below 380 nm as much as possible. Special attention should be paid to the anti-ultraviolet function of the glass lens when purchasing. From the statistics of random inspections, it is difficult for the glass to fully meet the anti-ultraviolet requirements. 2. Relevant safety performance labels. Sunglasses with safety protection performance. The lenses are made of impact-resistant materials such as PC films. The labels and instructions are often marked with 'impact resistance\'Meet European and American high standards' and so on. If the product can meet the requirements of the label, it is a good choice for consumers who have special requirements for safety performance such as motorcycle riders and drivers. Many people mistakenly believe that the depth of the lens color is directly proportional to the UV protection performance. The fact is that the color depth of the lens only refers to the transmittance of visible light, which can be judged by the naked eye, while the ultraviolet light cannot be observed by the naked eye. The UV protection performance of the lens is only It can only be detected by an ultraviolet spectrum analyzer. A simple way to test UV protection is: take a hundred yuan banknote and put it in the light zone of the purple light. After turning on the light switch, the pattern on the renminbi will be displayed in yellow under the light, which is very clear. At this time, put the sunglasses on the RMB, the pattern will disappear immediately due to the blocking of ultraviolet rays, which shows that the sunglasses have the ability to block ultraviolet rays. If the pattern does not disappear in the reflective area, it indicates that the sunglasses do not have the function of anti-ultraviolet rays. Such sunglasses are unqualified and cannot be bought.
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