In spring and summer, the sun becomes dazzling. Maybe everyone needs a pair of sunglasses. Today, let's talk about sunglasses. I found that some people wear sunglasses and some don't. is it good to wear sunglasses? Is it necessary to wear sunglasses? Here we can definitely tell you that you must wear sunglasses, especially when the sun is strong. It's not just for beauty and decoration. Wearing sunglasses has many benefits. Let's take a look with this website.
One of the most important functions of sunglasses is to block the strong light and avoid too much harmful light such as ultraviolet rays from entering the human eye and causing damage. If you wear sunglasses in summer, first: it can reduce the adjustment burden of the ciliary muscles of the eyes under strong light and let the human eyes see objects under the habitual natural light, which is the most comfortable time for the human eyes. Second: wearing sunglasses is not only to block harmful light, but also to prevent sand and dust particles from entering the human 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 activities have become more and more frequent, resulting in more and more harm to human body caused by ultraviolet rays, especially in Qinghai, Tibet and other plateau areas of China. Due to the long sunshine time, it is most vulnerable to ultraviolet rays. Therefore, people living in these areas should especially wear sunglasses.
In the earliest days, there was only one kind of sunglasses with large frame and large lens. Because it looked like two eyes of a toad, it was also called toad mirror at that time. It was round, and there was only one color, black. Now it is different. There are several kinds of sunglasses here, such as wide edge, narrow edge, square, round, long and partial, and there are many colors. Red, green, yellow and amber make the candidate's eyes dazzled, Now there are more than 20 kinds of sunglasses. There is a big choice, but I don't have an idea. But not all colors are good for your eyes. In addition, the sunglasses you like don't necessarily suit you. Let's talk about the color of sunglasses first.
At present, the production materials of solar lenses on the market are basically the same as those of myopia lenses, which are also divided into two categories: glass and resin. However, the processing processes of the two are different. The sunglasses of glass lenses are mainly mixed with some metal salts with special absorption properties in the glass materials. For example, the glass lenses with nickel and cobalt are purple, and the glass lenses with cobalt and copper are blue, The sunglasses with resin lenses mainly adopt the immersion dyeing method, which is to immerse the lenses in the 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 such a variety of sunglasses in the market, which one should we choose?
Expert: from the perspective of human physiology, gray, green and Tan are good for human eyes, and too deep and too shallow are not good. Different colors of sunglasses have different functions. Please choose one that suits you,
Blue gray: the absorption rate of visible light is the highest, and the visual effect is dark.
Mercury: it adopts high-density lens coating, which is suitable for outdoor sports.
Yellow: improve contrast and provide more accurate video, also known as night vision goggles.
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, and filter out a large amount of blue light. In the case of serious air pollution or foggy, the wearing effect is better.
Leipeng green: while absorbing ultraviolet rays, it maximizes the green light reaching the eyes. It is suitable for people who are prone to fatigue.
However, sunglasses with too dark color are likely to have traffic accidents due to poor traffic signal recognition ability, and sunglasses with too light color can not block the sun. At present, China has only made strict regulations on the traffic signal recognition ability of sunglasses with red, green and yellow colors, and there are no relevant regulations for other colors, but here's a trick. You might as well try it when choosing Sunglasses: you must try them when you buy them, Look at the color difference of the surrounding environment. Generally speaking, the color of sunglasses with small color difference change is more appropriate.
In fact, the darker the UV proof material is, the more UV proof the sunglasses are produced, but it is not related to the sunglasses. The darker the sunglasses are made of, the more UV proof material is. In fact, it is not related to the sunglasses that are sold, The UV protection function of sunglasses can reach 97% at most and less than 100% at all, so when you see Sunglasses with uv100% logo, it is actually not worthy of the name; Determine whether sunglasses are UV resistant,
In addition to seeing whether it has UV logo, you can also see whether the frame edge of the lens is smooth. The lens with smooth edge is made of resin material. This kind of lens has strong UV protection function. The lens with wavy edge is generally made of glass material. This kind of lens not only has poor UV protection function, but also easy to produce degrees during installation, which is harmful to our eyes.
How to choose a qualified and good-looking sunglasses
1. It's better to choose a professional glasses store to buy Sunglasses, or choose a guaranteed mall with physical stores for online shopping, such as golden sight outdoor products franchise. In addition to these formal glasses operators, many Sunglasses sold in the market come through informal channels. Most of these products come from some manual workshops with poor conditions and equipment. Due to the lack of perfect testing and management, these sunglasses may be fashionable, but they have no quality, and the damage to the eyes can be imagined. Moreover, if conditions permit, try to choose some larger brands to buy.
2. Tag: in addition to telling you the manufacturer, trademark and place of production of glasses, the tag also hides a lot of useful information, such as whether your glasses are sunglasses or light colored glasses, resin lenses or other materials. UV protection, etc.
3. Lens quality: the simplest way to identify the lens quality is to shake the glasses back and forth in front of your eyes to see if the object moves with the lens.
4. Color: the color selection of the lens shall 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, the UV index, that is, the effect of filtering ultraviolet rays, is a very important standard. At present, the UV index of most sunglasses is between 96% - 98%, and dark lenses are better than light lenses.
6. Spectacle frame: the selection of appropriate spectacle frame is also the guarantee for a pair of glasses to obtain good optical correction effect. Don't be too big or heavy, and don't wear it for too long, otherwise you will easily fall into the trap of sunglasses and wear some "Sunglasses syndrome"
7. Lens material: at present, the most common on the market are glass and resin. 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 light transmittance. Therefore, the best choice is resin lens.