Introduction to Sunglasses Testing Methods and Standards1

K: sunglasses material Sunglasses are a kind of vision protection products to prevent the strong irritation of the sun from causing damage to the eyes. At the same time, they are also a kind of special decoration that is fashionable or embodies personal style. Recommended reading: [Glasses Tips] The choice of men's sunglasses: The protective and decorative effects of sunglasses make people keen to use them, but because they directly affect personal safety when used, their quality requirements are particularly high. Quality inspection rules A pair of sunglasses play an important role outdoors in strong sunlight, and qualified sunglasses should have a sunglasses inspection report. Judging the pros and cons of sunglasses can be examined from both the quality and aesthetic aspects. There are personal factors in aesthetics, but there are certain standards for quality. The quality of sunglasses mainly refers to the quality of the lenses. At present, the universal standard in the world is the US Food and Drug Inspection Agency (F·D·A) standard. 1. According to the F·D·A standard, the lens should filter out more than 90% of the ultraviolet rays in the sun while ensuring the light transmittance. The lens should be affixed with the label 'UV-100PROTCT10N'. When 100% of the ultraviolet rays are filtered out, it should be affixed 'UV-400PROTCT10N' label, so it is very important to check the UV label on the lens. 2. The lens cannot have the 'power' that an optical lens has. Generally, if the diopter exceeds 15%, you will feel dizzy when wearing it. 3. The lens must have high strength and pass the impact resistance test. Generally speaking, the strength of plastic sheets (propionic acid or cellulose acetate), resin sheets, and glass sheets ranges from small to large. How to choose the sunglasses that suit you? People who often ride bicycles are best to wear resin lens sunglasses; when exercising, wear sporty sunglasses with a larger curvature or add a belt or chain; people with nearsightedness or hyperopia can wear sunglasses lens clips or special optical sunglasses. In spring and autumn, choose sunglasses with lighter lenses and stable frame colors; in winter, choose more gorgeous frame colors, and wear sports sunglasses with color film on snowy days. In winter, choose sunglasses with slightly larger frames to prevent wind. A pair of sunglasses may differ in price due to differences in brand, material, packaging, style, color, and publicity. Consumers should fully consider manufacturing costs, sales and services, and other links. The quality of sunglasses worth twenty or thirty yuan is often not guaranteed. Go to a larger spectacle store or a spectacle counter in a big shopping mall to buy, generally you can get a better guarantee in terms of quality inspection, sanitary inspection, and so on. Page description: The quality of sunglasses worth 20 or 30 yuan is often not guaranteed. Go to a larger spectacle store or a spectacle counter in a big shopping mall to buy, generally you can get a better guarantee in terms of quality inspection, sanitary inspection, and so on.
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