China News Service Client, Beijing, May 10 (Zuo Yukun) "Mom, my eyes hurt!" "Mom, my hands hurt!" "Mom, my neck hurts!"

　　If you make such a sigh at home, your mother will quickly walk to you and eagerly say to you, "Let you play with the computer, let you play with the mobile phone! If you do not sleep all day long, you will know to play with the computer Phone! "

　　Computers and mobile phones have always been "minefields" in family relationships, but the long life at home has forced students to learn online facing the computer and mobile phone screen every day. Out of concern for children's eyes, many people turned their attention to anti-blue glasses when it was impossible to stop online lessons.

Anti-blue light glasses. Photo courtesy of interviewees

Online teaching drives anti-blue light glasses to sell

　　Recently, the "Queen of Goods" Wei Ya brought a pair of anti-blue glasses in the live broadcast. The main black model was shot after more than a minute on the shelf. According to the introduction in the live broadcast, these anti-blue light glasses can block 60% of harmful blue light, relieve eye fatigue and stress, and there are special children's models, which can be worn by children over 5 years old.

　　In Danyang, Jiangsu, the world's largest lens production base, known as "One lens for every two people wearing glasses in the world, is produced in Danyang," the demand for anti-blue light glasses increased significantly after resuming production and sales increased by 103% year-on-year. Another eyewear manufacturer said that not only did the new retail channel not decline, but it also increased by 400% year-on-year in the first quarter.

　　The reporter searched for "anti-blue light glasses" on the shopping website and found that the top sellers in sales volume can reach 20,000 to 40,000 monthly sales, of which the lowest price is only 6.9 yuan, and even the "first order 0.9 yuan" during the event, the price The higher is between 1,000 and 3,000 yuan.

　　The reporter inquired about several stores with better sales, and the customer service indicated that there were a lot more people who bought anti-blue light glasses recently.

　　As can be seen on the store's promotional page, the main functions of anti-blue light glasses are mainly anti-radiation and anti-blue light, which can block blue light ranging from 30% to 70%. The principle is that "the lens blocks the glare harmful from the screen of the electronic product. Light, your eyes are not so tired easily, and it will be more comfortable to look at computer phones ", and some stores have mentioned the effect of preventing myopia.

　　In an offline optician shop, the salesperson told reporters that during this time, especially during the May Day holiday, many parents brought their children to consult anti-blue light glasses: "Ordinary anti-blue light can sell more than a few to a few days a day Ten pairs. But many children are already short-sighted. Parents will take them to come with a degree of anti-blue light lens, watching computers wear anti-blue light, usually wear ordinary. "

Why should "Blu-ray" be prevented?

　　"I bought it, or myopia, at least a 50-degree increase in 4 months at home." "I bought it, and my mother also added an eye protector to me." On Weibo, many netizens said that their parents are also for themselves Arranged with anti-blue glasses. But the effect of the glasses is polarized in the comments.

Students at home online classes learn traffic safety knowledge online. Photo courtesy of Taigu traffic police

　　"Wear this to see that everything has color, and I feel that the entire field of vision has turned green, so I am too lazy to bring it." "The anti-blue light glasses I bought turned yellow, causing everything to look yellow, even the lens was reflective. My friend said my face was yellow. "

　　The appearance characteristics of anti-blue light glasses are very obvious. Its lenses are not purely transparent, but show a yellow color, the light reflected on the lenses is purple, and the ordinary lenses are green. Therefore, many people report that wearing anti-blue light glasses will yellow when looking at things. Long-term visual aberration will inevitably cause discomfort and even feel dizzy.

　　But at the same time, many people think that anti-blue light glasses are effective.

　　"I haven't studied this, but it's really good for my body. I watch mobile phones and computers for at least twelve hours a day. I don't wear glasses. It's very dry and uncomfortable for thieves." Every day I do n’t know how long I ’m going to stare, I ca n’t balance and rest, and the anti-blue light glasses are really useful. ”

　　So what is the principle of so-called "anti-blue light"?

　　According to the introduction of "China Science", blue light is common in natural light and white light. The natural light (white light) seen by the human eye is different from red light, orange light, yellow light, green light, blue light, indigo light, and violet light. The spectral composition of colors, different wavelengths visually show different colors.

　　The reason why blue light is "protected" by us is mainly because the energy of light is inversely proportional to its wavelength. The longer the wavelength, the smaller the energy, and the shorter the wavelength, the greater the energy. At present, similar to computers, mobile phones and other products with electronic screens, the light emitted by the display screens made of materials such as LEDs is mainly red, green, and blue, and blue light accounts for the main part.

　　The wavelength of blue light is about 380-500 nanometers. Compared to red and green light, blue light has greater energy, can penetrate all the structures of the eyeball, and enter the fundus, which can cause irreversible damage to the eye.

　　But blue light is not equal to blue light hazard. Blue light with a wavelength of about 445 to 500 nanometers is beneficial to the human body, has the effect of adjusting the biological rhythm, and sleep, mood, and memory are all related to it.

　　We usually say that blue light that damages the eyes refers to high-energy short-wave blue light HEV light. The wavelength is between 385 and 445 nanometers. Exposure to the eye can cause photochemical damage to the retina of the human eye, resulting in cataracts and macular disease of the retina .

Anti-fatigue, yes; anti-myopia, no

　　Prolonged exposure to blue light is indeed harmful, and harmful blue light should indeed be protected. So are the anti-blue light glasses useful?

　　"Qualified anti-blue light glasses can resist harmful blue light and improve discomfort symptoms such as visual fatigue, dry eyes, and uncomfortable viewing. However, you must choose a regular and qualified product. At the same time, there is no evidence to support its prevention and development of myopia. "Hao Jingjing, director of the Beijing Aier Glasses Optician Center, gave this answer.

Data map: Primary and middle school students check their eyesight with their parents. Wei Liangshe

　　According to reports, there are two main types of anti-blue light glasses on the market: one is the film anti-blue light, which belongs to the reflective anti-blue light, and the blue light reflects on the lens; the other is the film base anti-blue light, which is the material absorption type. , The special materials used can absorb harmful blue light.

　　But at present, many anti-blue light lenses on the market have no protective effect. A comparative test report issued by the China Consumers' Association showed that a so-called "anti-blue lens" was found to have exceeded the blue light performance during the comparative test; the Wuhan Municipal Quality Supervision Bureau also announced the implementation of anti-blue lens As for the results of the random inspection of risk monitoring, half of the 30 batches of samples tested as "anti-blue light glasses" had no anti-blue light effect.

　　In this regard, Hao Jingjing also reminded consumers to choose a professional brand that meets the national testing standards when buying, based on the national standard testing data, and do not listen to the exaggerated publicity of the business.

How to choose anti-blue glasses?

　　There are some anti-blue light glasses on the market that block more than 80% of the blue light, but it will be overkill. Cai Jianqi, director of the Visual Health and Safety Protection Laboratory of the China National Institute of Standardization, once said that some "anti-blue glasses" look very yellow, but high-blocking lenses with a yellowish color will not only protect the eyes but also cause color deviation. , Aggravating visual fatigue, and may even increase the risk of myopia-induced.

　　Hao Jingjing also said that it is not recommended that children wear too yellow anti-blue lens: "The anti-blue lens is not the yellower, the better, the too yellow lens is likely to prevent the beneficial blue light."

　　Generally speaking, it is more scientific for an anti-blue lens to block more than 30% of blue light, which can retain beneficial blue light.

　　There is a similar "anti-blue light" principle to the eye protection mode of electronic devices. An engineer engaged in research and development of electronic equipment told reporters that the eye protection mode is to adjust the brightness of the blue light in the three primary colors of the screen, and it will turn yellow when it is turned on, but the effect is actually not great. Cell phone eye damage and other factors such as stroboscopic also have a great relationship, filtering out blue light will also affect the look and feel. "So the pursuit of eye protection mode is better than a high-quality screen, as well as less watching mobile phones, more than anti-blue light tube."

　　Hao Jingjing said that it is more important to develop healthy and reasonable eye habits and maintain adequate outdoor sports than to hope for various anti-blue light devices to prevent myopia: "Children must pay attention to sitting posture and reading light when studying. At the same time, outdoor Exercise as long as possible, preferably more than 2 hours a day. "

　　In addition, Hao Jingjing also mentioned an internationally recognized "20-20-20" rule, which also helps to protect eyesight: every 20 minutes when looking at the electronic screen, the eyes leave the screen and look at least 20 feet (about 6 meters) away. Place, at least 20 seconds. (Finish)