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How to choose and wear sunglasses Sunglasses are generally divided into two major categories of light and dark, from a variety of colors. Determine the merits of quality wholesale sunglasses, the focus should be evaluation vertex and prism, transmission ratio characteristics, the table Surface quality and internal flaws, the assembly of precision and a number of technical indicators shaping requirements. Good quality pair of sunglasses can play the role of shade and ornamental appearance. But in the market, the actual situation is not optimistic. Some unscrupulous traders, consumers drilling chinese wholesale Not know much about the quality of the loopholes, the use of inferior materials, low-cost low-quality window glass or other material glasses. Poor uniformity of these materials, including stripes, bubbles and other miscellaneous Quality, can not block ultraviolet rays, does not meet the physical requirements of the TradeTang.com human eye. What is more, with very low visible light transmittance, UV transmittance is very high but the poor quality of plastic film production Sunglasses, cause harm to consumers. How to choose and wear wholesale china ? Experts advise consumers do not only pay attention to the style sunglasses, but also pay attention to its inherent quality. Qualified sunglasses, wavelength 3 15nm to 380nm transmittance between the UVA may not exceed 10% of the wavelength of 280nm to 315nm in the UV-transmittance should be The zero. Wearing such sunglasses can make the eyes of the cornea, lens and retina from UV damage. Some cheap sunglasses can filter out not only ultraviolet light, anti- And, after due and block visible light, so that ultraviolet radiation is more significant, such as poor do not wear sunglasses. Sunglasses are plain mirror series. According to national standards, most sunglasses, only 8 degrees with the positive and negative refraction, more than the margin of error is substandard products. According to researchers detected sunglasses on the market, there are nearly thirty percent of sunglasses refraction than tolerance, and some even as high as 20 degrees. Experts pointed out that the consumption of normal vision Who put this sunglasses as wearing a pair of myopia or hyperopia mirror, after a summer, consumers will be poor quality sunglasses, "training" as suffering from myopia or hyperopia Persons. When you wear sunglasses after the dizziness, nausea, glare and other symptoms, should immediately stop wearing.
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