What are the benefits of wearing sunglasses in summer?

Summer is coming, and everyone may have sunglasses. Let's talk about sunglasses today. We found that some people wear them and some people don't. So whether it is good to wear sunglasses in summer or not, let's look at the people's thoughts first.

1. Of course, UV protection is necessary;

2. It's not much use, I don't wear it every year;

Nowadays, young people wear that. Can they see the road clearly?

4. I never thought about it. It's beautiful and fun.

5. There is nothing to wear and play;

6. Fashion and personality;

7. I don't know if it's good. Anyway, I wear it when I remember it, and I don't wear it when I can't remember it.

We can tell you for sure that sunglasses must be worn, especially in the case of strong sunshine, not only for beauty and decoration. Wearing sunglasses has many advantages. Let's see what the movie says. Why do you have to wear them?

This is because one of the most important functions of sunglasses is to block strong light and prevent harmful rays such as ultraviolet rays from entering the human eye too much and causing harm. If you wear sunglasses in summer, you can first reduce the adjustment burden of the ciliary muscles in strong light, so that people can see things clearly in natural light, which is the most comfortable time for the human eye. Secondly, wearing sunglasses is not only to block harmful light, but also to prevent dust particles from entering people's eyes in windy weather, which has become the best haven for eyes to some extent. According to the expert's determination, since 1996, sunspot activities have become more and more frequent, and ultraviolet rays are more and more harmful to human body, especially in Qinghai, Tibet and other plateau areas in China, which are most vulnerable to ultraviolet rays because of long sunshine time. Therefore, people living in these areas should especially wear sunglasses.

The earliest sunglasses had only one kind of big frame and big lenses. Because they looked like toad eyes, people also called them frog glasses at that time. They are round and have only one color, black. Now they are different. We have wide-edged, narrow-edged, square, round, long and off-set, and there are many colors, including red, green and off-set.

At present, the production materials of sunglasses on the market are basically the same as those of myopia lenses, and they are also divided into two categories: glass lenses and resin lenses, but the processing technology is different. Sunglasses with glass lenses are mainly mixed with some metal salts with special absorption properties. For example, the glass lenses with nickel and cobalt are purple, the glass lenses with cobalt and copper are blue, and the sunglasses with resin lenses are mainly dip-dyed. It is to soak the lenses in hot water dissolved with organic pigments for coloring, but no matter which coloring method, the color of sunglasses must be beneficial to our eyes. So which one should we choose in the face of so many colors of sunglasses on the market?

Expert: From the perspective of human physiology, gray, green and brown are good for human eyes, but too deep and too shallow are not good.

Too deep sunglasses are easy to cause traffic accidents because of poor traffic signal recognition ability, while too shallow sunglasses can't stop the sun. At present, China has only made strict regulations on the traffic signal recognition ability of red, green and Huang San sunglasses, but there is no relevant regulation on other colors. But here is a trick that you may wish to try when choosing sunglasses: you must try it when buying it and see the color difference changes in the surrounding environment. Generally speaking, sunglasses with small chromatic aberration change are its color. As we all know, one of the most important functions of sunglasses is to prevent ultraviolet rays. The reporter learned in the interview that many consumers think that dark sunglasses are definitely anti-ultraviolet, while light sunglasses are not anti-ultraviolet. So, is that it?

Let's do a comparative experiment: these are three kinds of dark brown sunglasses with the same brand and material, but different shades. The test results show that the three curves finally reach the same coordinate point, which proves that these three kinds of sunglasses have the same anti-ultraviolet function. Therefore, whether sunglasses protect against ultraviolet rays has nothing to do with the color depth of the mirror, but with the materials used to make the lenses. If anti-ultraviolet materials are added in the production process of sunglasses, they are sunglasses with anti-ultraviolet function. Such mirrors are generally sold with UV logo. However, due to the limitation of the current processing technology, the anti-ultraviolet function of sunglasses can reach up to 97%, but it can't reach 100% at all, so when you see sunglasses with UV 100% logo, it's actually not worthy of the name; To judge whether sunglasses are UV-proof, you can also see whether the edge of the lens frame is smooth. The lens with smooth edges is made of resin and has strong anti-ultraviolet function. The lenses with wavy edges are generally made of glass, which not only has poor anti-ultraviolet function, but also is easy to produce degrees when installed, which is harmful to our eyes.

There are two mirrors, one is resin and the other is glass. There are other ways to distinguish: resin sheet or glass sheet can be light, resin light and glass heavy; You can also knock with your hands and listen to the sound. Good sunglasses should not only protect against ultraviolet rays, but also have several requirements.

Good sunglasses should be powerless at first. At present, some inferior sunglasses on the market are not up to standard because of the materials and technology used, so some sunglasses are produced with power, and the power is very small, so it is generally not easy to be detected. If we wear it for a long time, it will hurt our eyes. What should we do?

You can find a book or newspaper with words on it, or you can move the mirror up and down away from your body. If you find a horizontal object jumping in the distance, it also proves that sunglasses are moderate. Of course, you can't choose this mirror.

See this card? Very useful. You can't see anything with the naked eye. Wear sunglasses. There are scenery or people fishing on it, which proves that this kind of sunglasses has good light transmission performance and is good for human eyes. But this method is only suitable for sunglasses with polarized lenses, so-called polarizers, not lenses of any special material. What happened?

Simply put, light will be refracted when it meets the surface of an object. This process of refraction is called polarization. Under normal circumstances, when the sun shines on the lens surface, the light waves will appear "gradual change" on the mirror surface, that is, all the light waves will spread in the same direction, which will cause what most people usually call "glare", which is particularly dazzling. What do we do? People try to use a special filter membrane and put it in the lens to filter out the glare in the reflected light. Sunglasses produced by this technology are called polarizers. This kind of mirror has good light transmission, can see through the glare caused by underwater, heavy snow and ice, and can also see the slippery road. The color is real and the perspective is good, but this kind of mirror 400-500 yuan is a little more expensive and relatively better. This method is only applicable to. At present, there is no regulation on the visible light transmittance of sunglasses in China, so it is best to see your eyes with the naked eye, with good transmittance. But whether it's a polarizer or a non-polarizer, good sunglasses should still suit you. What do you mean? Not only bring comfort to yourself, but also others look good. Some people wear mirrors and look awkward, so they must be suitable for people's faces.

Glasses consultant: There are roughly three kinds of faces, long, round and Chinese characters. What kind of mirror should I wear?

When choosing sunglasses, you should also pay attention to the color of sunglasses that must match your skin color. Generally speaking, fair-skinned people prefer sunglasses, because fair-skinned people are suitable for friends with dark and yellow skin. I suggest you try green sunglasses.

Moderator: Sunglasses are very popular this year. The earliest frog mirror has a resurgence, but it is not suitable for people with small faces. Frameless and screw-textured mirrors are also popular this year, and young people buy more. There are many middle-aged candidates for this kind of drill. Having said that, here are two things to remind you: don't wear it often, because it is bright outside, and some people even bring it after entering the house. It's not really good. Second, it's always dark, and you have to constantly dilate your pupils to see distant objects, so your eyes are very tired. Others say that wearing sunglasses will not cause spots? No, it has something to do with endocrine, but not with ultraviolet rays. Don't think that wearing sunglasses will prevent everything.

1. Can sunglasses only be worn in summer?

Of course not. The main function of sunglasses is to block strong light, so in fact, after the heavy snow in winter, it is best to wear sunglasses to block strong light and protect your eyes.

2. Are the sunglasses on the roadside stand credible?

Not credible. The quality of sunglasses in roadside stalls cannot be guaranteed, because the lenses of these sunglasses are likely to be plastic, and the cost of plastic is very low, which not only protects against ultraviolet rays, but also has poor light transmission effect, so never buy sunglasses for children on the roadside.

3. How about big frame sunglasses?

Of course not, because the lower orbital edge of the large-frame solar hinge is worn just to press the outlet of the infraorbital nerve. With the extension of wearing glasses, local skin numbness, dullness, visual fatigue and other symptoms will appear around the eyes. I suggest you choose sunglasses with a small bar.

4. Can wearing sunglasses really protect eye skin from spots?

This may not be true. The skin around the eyes is not a long spot, which has little to do with ultraviolet rays and is related to human endocrine, so don't think that wearing sunglasses can protect the skin around the eyes. Actually, wearing sunglasses just protects your eyes.

5. Can crystal glasses open your eyes?

This statement is not appropriate. Crystal is known as a good eye care product because of its hard texture, good thermal insulation and cool feel, but crystal lenses can transmit more than 80% ultraviolet rays, which is harmful to people's eyes. After the eyes absorb too much ultraviolet light, it will cause lens opacity and affect vision. According to international standards, the UVA allowed to penetrate glasses should be below 10%. However, crystal lenses can transmit about 90% of long-wave ultraviolet UVA and 90% of medium-wave ultraviolet UVB, so it is not worth the loss to compare the disadvantages of ultraviolet damage with the advantages of nourishing purpose, while ordinary optical lenses, high refractive glass lenses and coated lenses all have the functions of absorbing and intercepting ultraviolet rays. The optical properties of crystal glass are far less than those of ordinary optical glass. In addition, the crystal is a timely crystal, which contains many irregular impurities with flocculent ripples in the middle. It is a heterogeneous medium with birefringence, which refracts light to form a double image and causes unclear vision. So neither rock crystal nor artificial crystal is suitable for glasses.