How to choose a qualified and beautiful sunglasses?

How to choose a qualified and beautiful sunglasses?

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 to cause 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. Different shades have different functions, please choose the one that suits you.

Blue-gray: the absorption rate of visible light is the highest, and the visual effect is dark.

Mercury: high-density lens coating, suitable for outdoor sports.

Yellow: Improve contrast and provide more accurate video, also known as night vision goggles.

Gray film: absorbs any spectrum evenly, so the scenery will only darken, but there will be no obvious color difference, showing a true and natural feeling.

Brown film: improve visual contrast and clarity, and filter out a lot of blue light. In the case of serious air pollution or fog, the wearing effect is better.

Ray Peng Green: While absorbing ultraviolet rays, let the green light reach the eyes to the maximum extent, which is suitable for people who are prone to fatigue.

However, sunglasses with too dark color are easy to cause traffic accidents due to poor traffic signal recognition ability, and sunglasses with too light color can't stop the sun. At present, China has only made strict regulations on the traffic signal recognition ability of sunglasses with three colors: red, green and Huang San. There are no relevant regulations for other colors, but here is a trick. When choosing sunglasses, you may wish to try it: you must try it when buying it to see the color difference of the surrounding environment. Generally speaking, sunglasses with small color difference change are good.

Many people think that the darker the color of sunglasses lenses, the more uv-proof they are. In fact, 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 to the production of sunglasses, they are sunglasses with anti-ultraviolet function. This kind of mirror is usually marked with UV. However, due to the current processing technology, the anti-ultraviolet function of sunglasses can reach 97% at the highest, and it can't reach UV 100% at all. Jud whether that sunglasses are ultraviolet-proof,

In addition to seeing whether there is a UV logo, 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.

How to choose a qualified and beautiful sunglasses?

1, it's best to choose a professional optical shop to buy sunglasses, or choose a guaranteed mall merchant with a physical store online, such as Golden Sight outdoor products franchise. In addition to these regular glasses operators, many sunglasses sold in the market come through informal channels. Most of these products come from 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 at all, and the damage to the eyes can be imagined. Moreover, if conditions permit, try to choose some bigger brands to buy.

2. Label: In addition to telling you the manufacturer, trademark and origin of the glasses, the label 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. Whether it is anti-ultraviolet and so on.

3. Lens quality: One of the easiest ways to distinguish the quality of a lens 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 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 with different colors can be effectively recognized.

5. Ultraviolet Index: For sunglasses, the ultraviolet index is a very important standard, that is, the effect of filtering ultraviolet rays. At present, the ultraviolet index of most sunglasses is between 96% and 98%, and dark lenses are better than light lenses.

6. Frame: Choosing the right frame is also the guarantee for a pair of glasses to obtain good optical correction effect. Don't be too big, too heavy, and don't wear it for too long, otherwise it's easy to fall into the sunglasses trap and wear some "sunglasses syndrome"

7. Lens material: At present, the most common materials on the market are glass and resin. The disadvantage of glass lenses is that they are 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. So the best choice is resin lenses.