As summer approaches, the weather in the south gradually heats up. Many young hipsters started wearing sunglasses when they went out. But be careful: you should try to wear sunglasses outdoors, but not all situations are suitable. In a shaded place or indoors without sunlight, you can take off your sunglasses and let your eyes rest in natural light for a while.

Only by choosing sunglasses scientifically can you protect your eyes

1. When buying sunglasses, you must pay attention to the lens, tag, color and UV index of the product. Every regular and qualified product has a certificate of quality inspection, and the merchant should show the relevant certificate when purchasing.

The tag on the sunglasses is the "ID card" of the product, which indicates the origin of the glasses, and also hides a lot of useful information, such as whether the glasses you bought are sunglasses or light-colored glasses, resin lenses or other materials... None of this should be ignored.

In addition, consumers should keep the labels or instructions well, or ask the merchants to mark the commitment on the product logo on the invoice. Once a dispute arises, they will not be passive due to lack of evidence.

2. When choosing, pay attention to the smooth surface of the lens, without ripples, flaws, bubbles, or wear marks. To lay the lens flat, observe the lens from the horizontal direction for warping. Lenses that are uneven or have traces or bubbles should not be purchased. A simple identification method is to put the sunglasses in front of your eyes, observe the distant target through the lens, such as the window frame or door frame, etc., and then move the glasses up and down, back and forth, the target should not have swinging or wavy deformation.

3. In order to protect against ultraviolet rays, it is best to buy sunglasses with light gray, light green, and blue gray lenses that really have a sunshade effect, because these relatively soft colors will not change color when looking at nature. For sunglasses, the UV index is an important criterion for filtering out ultraviolet rays. At present, the UV index of most sunglasses is between 96% and 98%, and dark lenses are better than light lenses.

4. If you require a strong shading effect, you should choose darker lenses. However, cyclists or motorists cannot choose lenses that are too dark in color, so as not to be able to effectively identify traffic lights of different colors.

5. Choose sunglasses according to your face shape. People with big eyes should choose sunglasses with large frames, and those with smaller eyes should choose sunglasses with smaller frames. People with fat and round faces are suitable for wearing sunglasses with thick frames. People with thin and long faces are suitable for sunglasses with round frames. People should choose sunglasses with a slightly narrower square frame.