How to choose sunglasses scientifically

u003cbru003eNowadays, sunglasses have become essential equipment to follow the trend and look cool. But not everyone is so good at buying sunglasses. In fact, in addition to reducing the stimulation of strong light and making the eyes comfortable, the main purpose of sunglasses is to prevent ultraviolet rays from damaging the eyes. To this end, I teach you how to choose a pair of sunglasses that suit you and protect your eyes. Choose sun lens material. Lens materials are glass and resin, but polarized lenses should be used. It is made of synthetic resin, which is as lightweight and precise as contact lenses, and is composed of seven layers of thin sheets. The outer two layers are super hard wear-resistant layers; the second and sixth layers are anti-shatter strengthened layers; the third and fifth layers are ultraviolet filters. The middle layer is the polarizing filter layer. Polarized lenses can effectively filter out reflected light and harmful ultraviolet rays, and have anti-shatter and anti-wear functions. They are also the material of choice for popular sunglasses. YC9105 fashion sunglasses should first be matched with sunglasses according to their skin color, face shape and wearing; secondly, the color of sunglasses should be selected according to the place of entry and exit. Generally speaking, black, brown, and gray filter effects are good; gray lenses can absorb any color spectrum in a balanced manner, and the scene seen after wearing the glasses will only darken without obvious chromatic aberration; brown lenses can filter out a lot Blue light can improve visual contrast and clarity, and is particularly effective when worn under severe air pollution or fog. The color of the lens and whether it is UV-resistant are two different things. Even if the color of the lens is dark, it may not be able to effectively prevent UV. Only sunglasses with UVA, UVB and CE marks on the mirror or tag can guarantee a certain amount of UV. The UV index is usually between 96% and 98%. Generally, regular eyeglass shops will have instruments to detect the ability of sunglasses to resist ultraviolet rays. You may wish to test your sunglasses when you buy. First, see if the lens is flat. Hold the two corners of the sunglasses against the fluorescent lamp with your hand, and let the reflective strip of the mirror roll smoothly. If you find that the fluorescent lamp shadow reflected by the mirror is wavy or twisted, it proves that the lens is not flat. Such a mirror will damage your eyesight. In addition, observe whether the lens has scratches, impurities, bubbles, streaks, etc. At the same time, try to see if you have any symptoms of discomfort. Common symptoms of discomfort are dizziness and headache. Related reading: Sunglasses Brand Sunglasses
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