How to scientific choose sunglass

Nowadays, sunglasses has become a trendy generation cool the necessary equipment. But not everyone is so good at the choose and buy sunglasses. In fact, sunglasses in addition to reduce glare, make the eyes comfortable, main purpose is to prevent ultraviolet damage to the eyes. To this end, small make up teach you how to choose and buy a pair of suitable sunglasses can protect eyes again. Choose the sun glasses lens material made of glass and resin, and the good polarized lens should be used. It USES as well as contact lenses and precision made of synthetic resin, synthesized from seven layer chip, two outside layer is hard wear-resisting layer; Second, six is shatterproof strengthening layer; The third and fifth layer is the uv filter layer, middle layer is polarized filter layer. Polarized lenses can effectively filter out reflected light and harmful uv rays, and resistant, wear, and other functions, is also a popular sunglasses chosen material. YC9105 fashion sunglasses sunglasses factory according to the first of their skin color, face, and dress to match sunglasses; Second should choose sunglasses color according to the in and out of place. In general, black, dark brown, grey filter effect is good; Grey lens for any chromatography can balance absorption, wearing glasses can see scenery will only after dark and do not have clear off color, Dark brown lens can filter out a lot of blue light, which can improve visual contrast and clarity, under the condition of air pollution is serious, or foggy wearing effect is a plus. Whether the lens color and UV protection are two different things, even if the lens color deep, also won't be able to effectively prevent UV, only the mirror or tags have marked as both UVA and UVB rays and CE mark sunglasses can ensure that block UV. The UV index usually in 96% 98%. General optical shop will have formal testing sunglasses uv resistance capability of the instrument, might as well give you when buying sunglasses detection. First to see if the lens is flat and level. Sunglasses two horns on the fluorescent lamp with your hands, let the mirror reflective article gently rolling, if it is found that mirror the daylight lamp shades appear wavy, distortion, prove that the lens is not flat, the mirror can damage eyesight. Also observe lenses have scratches, impurities, bubbles, stripes, etc. At the same time, also want to try to see if you are unwell symptom, common symptoms are dizziness and headaches.
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