In spring and summer, the sun becomes dazzling. Maybe everyone needs a pair of sunglasses. Today, let's talk about sunglasses. Some people wear sunglasses and some don't wear them. Is it necessary to wear sunglasses? Here we can tell you for sure that you must wear sunglasses, especially in the case of strong sunlight, which is not only for beauty, decoration, wearing sunglasses has many benefits. Let's have a look.
One of the most important functions of sunglasses is to block the strong light, so as to avoid the harmful light such as ultraviolet rays from entering the eyes too much and causing harm. If you wear sunglasses in summer, first, it can reduce the adjustment burden of eyelashes under strong light, let the eye look at objects under natural light, which is the most comfortable time for human eyes. Second, wearing sunglasses is not only to block harmful light, but also to prevent dust particles from entering into people's eyes in windy weather To a certain extent, it has become the best haven for the eyes. According to the determination of relevant experts, since 1996, sunspot activity has become more and more frequent, resulting in more and more damage to human body caused by ultraviolet rays, especially in Qinghai, Tibet and other plateau areas in China, because of the long sunshine time, here is the most vulnerable to UV damage. Therefore, people in these areas should especially wear sunglasses.
At that time, there were only a few kinds of glasses with the same color as the toad's garden. At that time, there were only a few kinds of glasses with the same color as the toad's garden, such as the red and the big ones Yellow and amber make the candidate's eyes dazzled. Now there are more than 20 kinds of colors. There are more choices, but there is no idea. It's not all good for the eyes. In addition, the sunglasses you like are not suitable for you. Let's talk about the color of sunglasses first.
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 sheet and resin sheet. However, the processing technology of the two kinds of sunglasses is different. For example, the glass lenses with nickel and cobalt are purple, and those with cobalt and copper are blue, However, the sunglasses of resin lenses mainly adopt immersion dyeing method, that is, immersing the lenses in hot water dissolved in organic pigments for coloring. However, no matter which coloring method, the color of sunglasses must be beneficial to our eyes. So, in the face of sunglasses with so many colors on the market, which one should we choose?
- Expert: from the perspective of human physiology, gray, green and Tan are good for human eyes, too deep or too shallow are not good. Different color sunglasses have different functions. Please choose one that suits you,
- Blue gray: visible light absorption rate is the highest, the visual effect is dark.
- Mercury: using high density lens coating, suitable for outdoor sports people.
- Yellow: improve contrast, provide more accurate vision, also known as night vision mirror.
- Gray film: it absorbs any spectrum evenly, so the view will only darken, but there will be no obvious color difference, showing a real and natural feeling.
- Tan film: improve visual contrast and clarity, filter out a lot of blue light. When the air pollution is serious or foggy, the wearing effect is better.
- Ray pen green: in the absorption of ultraviolet light, maximize the green light to the eyes, suitable for people who are easy to fatigue.
However, dark sunglasses are likely to cause traffic accidents due to poor traffic signal recognition ability. Too light sunglasses can't block the sunlight. At present, China only has strict regulations on the traffic signal recognition ability of red, green and yellow sunglasses. There are no relevant regulations for other colors. But here's a trick. When you choose sunglasses, don't you Don't give it a try: that is, you must try to take it when you buy it. Look at the size of the color difference change of the surrounding environment. Generally speaking, the color of sunglasses with small color difference is more appropriate.
Many people think that the darker the color of sunglasses, the more UV proof they will be. In fact, whether sunglasses are UV proof or not has nothing to do with the color of the mirror, but has something to do with the lens production materials. If the sunglasses are added with anti ultraviolet materials during production, they are sunglasses with anti ultraviolet function. Generally, such mirrors are labeled with UV when they are sold. However, due to the fact that the sunglasses are not UV resistant, they are not related to the color of the mirror Limited by the current processing technology, the UV protection function of sunglasses can reach 97% at most, which is less than 100%. Therefore, when you see Sunglasses with uv100% logo, they are actually not worthy of the name. To judge whether sunglasses are UV proof or not, they are not up to the name,
In addition to checking whether it has UV identification, you can also see whether the edge of the lens frame is smooth. The lens with smooth edge is made of resin material. This kind of lens has strong anti ultraviolet function. The lens with wavy edge is generally made of glass material. This kind of lens not only has poor anti ultraviolet function, but also is easy to produce degree during installation, which is harmful to our eyes.
How to choose a qualified and good-looking sunglasses
1. The best way to buy Sunglasses is to choose a professional eyeglass store, or online shopping to choose a protected store with physical stores, such as golden sight outdoor products. In addition to these regular glasses business operators, there are many sunglasses in the market through informal channels. Most of these products come from manual workshops with poor conditions and equipment. Due to the lack of perfect inspection and management, these sunglasses may be fashionable, but they have no quality to speak of, and the damage to the eyes can be imagined. Moreover, if conditions permit, choose some larger brands as much as possible.
2. Hangtag: in addition to telling you the manufacturer, trademark and place of production of the glasses, the tag also hides a lot of useful information, such as whether the glasses you choose are sunglasses or light colored glasses, resin lenses or other materials. Whether it is UV proof, etc.
3. Lens quality: the simplest way to identify lens quality is to hold the glasses and shake them back and forth in front of your eyes to see whether the object moves with the lens.
4. Color: the color selection of the lens should be based on the principle that the color of the surrounding environment is not distorted, the edge of the object is clear, and the signal lights of different colors can be effectively identified.
5. UV index: for sunglasses, UV index, that is to say, the effect of UV filtering is a very important standard. At present, the UV index of most sunglasses is between 96% and 98%, and the dark lens is better than the light color lens.
6. Frame: choosing the right frame is also a guarantee for a pair of glasses to get good optical correction effect. Don't be too big or too heavy, and you should not wear it too long. Otherwise, you will easily fall into the sunglasses trap and wear some "Sunglasses syndrome"
7. Lens material: glass and resin are the most common on the market. The disadvantage of glass lens is that it is fragile and easy to stab the eyes. Compared with glass, resin lens has the following advantages: not easy to break, light weight, and high transmittance. Therefore, the best choice is resin lens.
