Summer sunglasses purchase guide

　　Inferior sunglasses are unclear, it cannot resist ultraviolet rays, and the result is that the pupil is expanded, so that the eye lens takes more ultraviolet rays, so it is necessary to choose a reputable store to buy. So what should I pay attention to buying sunglasses? First, first observe whether the lens is scratched, impurities, bubbles, stripes, check the outer packaging of sunglasses, and regular sunglasses should be marked with product name, color, diameter, quality level, manufacturer name and trademark, mirror or tag. Sunglasses that prevent UVA, UVB and CE logo ensure the barrier of certain ultraviolet rays. Second, when you buy a sunglasses, try there is no dizziness and headache. There are also some narve sunglasses for margin in the market, but because of the differences such as the distance from person to person, if there is no professional guidance, consumers should not choose this kind of sunglasses. Third, with the two corners of the sunglasses to keep the sunlight, let the reflective strips of the mirror smoothly, if the sunlight shadow of the mirror reflection occurs, twist, prove that the lens is not flat, such a mirror will damage vision. Fourth, the lens should be flat, the deserves are high, the solar lens is made of glass and resin, and the best sunglasses should be polarized.

　　It is made of a synthetic resin, which is as lightweight as the contact lens, synthesized from seven layers of sheet, and the outermost layer is a superhard wear layer; the second, six layers are anti-rolling, third, five floors is ultraviolet rays. The filtration layer, the most intermediate layer is a polarizing filter layer. The polarized lens can effectively filter out reflected light and harmful ultraviolet rays, and have functions such as anti-crushing, anti-wear, etc., which is the most popular sunglasses. Fifth, the color of the sunglasses will be selected according to their own skin, face, and wearing, and should be selected according to the entry place. In general, black, brown, gray filter effect is good; gray lenses can balance any chromatography, and the scene seen after wearing mirrors will only dim, and there will be no significant color difference; the brown lens can filter out a lot Blu-rays can improve visual contrast and clarity, which is more equipped with severe air pollution or more fog. Sixth, what kind of color is so popular with sunglasses? The simple self-test method is to wear sunglasses against the mirror, and you can see your own.

　　When the color is too shallow, the filter effect is too small; the color is too deep, affecting the vision and weakening the color. This year's popular colorful light sunglasses, don't use the water activities in the sea, in the strong snow, and the sun is very strong, but we should wearDynamic sunglasses, most of which use colorful saturated colors that absorb or reflect more visible light. Seventh, wearing sunglasses, in addition to reducing glare stimulation, the most important purpose is to prevent ultraviolet rays from harming the eyes, while the color of the lens is two things, even if the lens is deep, it may not effectively prevent UV, So you must choose a lens indicative of the UV function. Usually the UV index of sunglasses is between 96% and 98%. Eighth, general formal glasses stores have instruments for detecting sunglasses against ultraviolet capacity, through this test, you can know if the glasses in your hand help your eye health.