The choose and buy sunglasses should pay attention to what?

The sun is a kind of to prevent sunlight intense stimulation to the human eye damage eyesight health supplies beauty or personal style of special accessories, people can choose sunglasses according to different requirements, the choose and buy sunglasses is time should pay attention to some things. To check the quality of the lens, to see if the lens surface is smooth, with or without warping, grinding crack, air bubble. Lens warp can cause eye deviation, uneven or trace, bubble, can cause discomfort such as dizziness. Notice also that the lens can't be too thin, also can cause dizziness or high temperature deformation. Sunglasses factory 9803 fashionable sunglasses sunglasses can be get 45 centimeters from the eye, through the glasses look around vertical line and horizontal line, such as frame window or door frame, etc. , then glasses from top to bottom and move around. If the linear distortion or swing, indicated that the lens distortion, unfavorable buy. Sunglasses glasses and an important indicator of light transmittance, is through the lens of the luminous flux and the ratio of the incident light flux, is also a important performance index of the mandatory standards. If use light color sunglasses for shade, the wearer will not be able to obtain the shading effect. Use shading light color sunglasses in the mirror, affect the wearer clarity of vision. Put sunglasses at present, the observations of distant places through the lens, such as window frame or door frame, then glasses from top to bottom and move around, goals should not have swings and wavy deformation. Can also be observed under fluorescent lamp images on the surface of the lenses, turn the sunglasses make tubes images appear in different parts of the lens, light tube image deformation is preferred. The polarized sunglasses on the market, some products using thickness of 0. 7 mm resin polarized lens, due to the thin lens, is easy to produce deformation in the assembly, when the choose and buy should pay special attention to. The color of the lens can not partial, should make the color of the surrounding environment not distortion. Before without wearing sunglasses to observe the color such as red, green, yellow, and then put on sunglasses, observing the same object, observe the color of the two can't partial color, otherwise it will reduce the recognition ability of traffic lights. For lens for color, especially colorful sunglasses should pay attention to the identification.
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