Mao Yanfeng Han Xu reporter Li Jian

　　Recently, the Hebei Provincial Institute of Product Quality Supervision and Inspection, in view of the fact that consumers buy more sunglasses in summer, organized experts to combine daily inspection and testing data to release tips for purchasing sunglasses.

　　When choosing sunglasses, be sure to pay attention to the logo.

Regular sunglasses should have name, color, diameter, quality level, manufacturer's name and trademark.

At the same time, pay attention to the logo of the product. Sunglasses should have the logo of UV (abbreviation of Ultraviolet Rays in English, that is, ultraviolet rays), and lenses with an anti-UV coefficient of more than 400 can protect the eyes.

　　Look at the lens color.

Black, brown, gray filter effect is good.

The gray lens can absorb any color spectrum evenly, and the scene seen after wearing the lens will only become darker without obvious chromatic aberration; the brown lens can filter out a large amount of blue light, which can improve the visual contrast and clarity. It is especially effective to wear in foggy conditions.

The colors of the sunglasses lenses are light gray, brown or light smoke, followed by green, amber, blue, etc. Red is only used for sunbathing or snow.

　　Try it on.

If you experience symptoms such as dizziness, nausea, and dazzling after wearing sunglasses, take them off immediately.

You can take the sunglasses 45 cm away from the eyes, observe the surrounding vertical and horizontal lines through the glasses, such as window frames or door frames, etc., and move the glasses up and down, back and forth.

If the straight line is distorted or wobbled, the lens is deformed and should not be purchased.

　　Lens material.

The lens should be flat and the transparency should be high. The sun lens material is divided into glass and resin, and the high-quality sun lens should be polarized lens.

Polarized lenses are made of synthetic resin that is as light and precise as contact lenses. They are composed of 7 layers of flakes. The outermost two layers are super-hard wear-resistant layers; the second and sixth layers are shatter-resistant reinforcement layers; the third and fifth layers are UV filter layer, the middle layer is the polarizing filter layer.

Polarized lenses can effectively filter out reflected light and harmful ultraviolet rays, and have functions such as anti-shattering and anti-wear. They are the preferred sunglasses lenses.

　　If you think that sunglasses are just decorations, and they can be properly maintained at most in the mirror case, you are wrong. Sunglasses also need daily careful maintenance.

Use a soft detergent to clean the lenses, not only at the lenses, but also on the temples, nose pads and other places where grease and broken hair are likely to accumulate.

If it gets dusty, wash it off and wipe it with a soft cloth.

Remember, never scrub your lenses with hot water or put your sunglasses in damp places.