What should I pay attention to when buying sunglasses?

u003cbru003eTaijin is a kind of vision care products to prevent the strong irritation of the sun from causing damage to the eyes. Beauty or special accessories that reflect personal style. People will choose sunglasses according to different needs. It is time to pay attention to sunglasses. Some matters. Check the quality of the lens to see if the surface of the lens is smooth, warped, abraded, and air bubbles. The warping of the lens will cause the line of sight to deviate, unevenness or traces, air bubbles, and cause dizziness and other discomfort. Also note that the lens should not be too thin, otherwise high temperature deformation will also cause dizziness. With 9803 Fashion Sunglasses, you can take the sunglasses 45 cm away from your eyes, observe the vertical and horizontal lines around you through the glasses, such as window frames or door frames, etc., and then move the glasses up and down back and forth. If the straight line is distorted or oscillating, it means that the lens is deformed and should not be purchased. Sunglasses and glasses also have an important index of light transmittance, which is the ratio of the luminous flux through the lens to the incident luminous flux, and is also an important performance index stipulated by a mandatory standard. If light-colored sunglasses are used for sun-shading, the wearer will not be able to obtain the sun-shading effect. Use sun-shading mirrors as light-colored sunglasses, which will affect the clarity of the wearer's vision. Put the sunglasses in front of your eyes, observe the distant target through the lens, such as window frame or door frame, etc., and then move the glasses up and down back and forth, the target should not swing or wavy deformation. It is also possible to observe the image of the lamp tube on the surface of the sunglasses lens under a fluorescent lamp. Rotate the sunglasses to make the image of the lamp tube appear on different parts of the lens. Some of the polarized sunglasses on the market use resin polarized lenses with a thickness of 0.7mm. Because the lenses are thin, they are prone to deformation during assembly. Special attention should be paid when purchasing them. The color of the lens should not be biased, and the color of the surrounding environment should not be distorted. Before wearing sunglasses, observe red, green, yellow and other colored objects first, then put on sunglasses and observe the same object. The color of the two observations should not be color cast, otherwise it will reduce the ability to identify traffic lights. For the colored lenses, especially the brightly colored sunglasses, attention should be paid to the identification of this item. Related Reading: Sunglasses Polarized Sunglasses

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