Can anti-blue glasses really prevent myopia? Can myopia be saved after the long vacation?
condition
Anti-blue glasses playing children's cards is very popular.
According to some e-commerce platforms, many anti-blue glasses for children have been launched online.
Using the keyword "children's Blu-ray" to search, you can find that many online stores sell related products. Under the brand of glasses, tens of thousands of people pay the bill, leaving more than 20 thousand shopping comments, hundreds of people join, and the transaction amount is less.
These glasses, which are marked "for children with blue light prevention", all claim that they can filter blue light and prevent myopia. In some web page recommendations, this kind of glasses is even called "network classroom glasses". A student's "blue-light-proof wet room mirror" claims that "wearing it will not dry eyes, deepen the degree, splash water droplets, blue light damage ..." The price is as high as 999 yuan. Another kind of children's anti-blue glasses, claiming to be American OLP expert anti-blue glasses, costs 698 yuan a pair. More people claim that they can prevent radiation and myopia, and the price is generally between 200 yuan and 400 yuan. The cheapest is also tens of yuan a pair.
Children's parents
I heard that it can prevent myopia and wear blue glasses for children.
"Children go to class online every day. Seeing that his eyes were uncomfortable, he blinked and bought her blue glasses online. I heard that it can prevent myopia and radiation. " Ms. Jing, who lives in Tianhe District, has an 8-year-old child who is in the second grade this year. During the epidemic, she has been taking classes online at home for several months. In addition to classes, children stay at home every day, playing mobile phones and iPad from time to time. She believes that anti-blue glasses can relieve eye fatigue and reduce myopia caused by children's excessive use of electronic devices.
Parent Mr. Yang is also convinced that anti-blue glasses are effective for children. He told reporters: "After wearing anti-blue glasses, the electronic screen will be darker and less dazzling. Many people around me use it to protect their children's eyes. "
Li Guo, a student who lives in Meihua Village, Yuexiu District, is in the second grade of primary school this year. He told reporters that his parents bought him anti-blue glasses and asked him to wear them when surfing the Internet. At first, something on his nose made him feel uncomfortable, but after wearing it for more than a month, he didn't feel anything except that his eyes were blurred occasionally.
The reporter noticed that on some online shopping platforms, some parents left a message in the after-sales feedback: "After wearing anti-blue glasses, I feel dizzy, disgusting and want to vomit."
concentrate
Is the intensity of blue light on the screen harmful to the eyes?
Expert: There is no scientific basis!
Can children wear anti-blue glasses that are popular now? Can you really prevent myopia? Yesterday, the reporter of New Express interviewed Associate Professor Cui Dongmei from the Department of Refraction and Low Vision of Sun Yat-sen University Eye Center with many questions, seeking answers one by one.
"Although studies have shown that harmful blue light with a wavelength of 4 15 ~ 455 nm will cause photochemical damage to the retina, which may lead to decreased vision and increase the risk of age-related macular degeneration, the American Ophthalmology Association clearly pointed out that there is no scientific evidence that the intensity of blue light emitted by mobile phones, computers and other devices will cause harm to the eyes." Dr. Cui Dongmei stressed: "We rarely see macular damage caused by watching mobile phones and computers in clinic, but more because of visual fatigue, dry eyes and irregular astigmatism caused by watching mobile phones and computers."
Regarding whether children are suitable to wear anti-blue glasses, Associate Professor Cui Dongmei told reporters: "We don't recommend that you wear anti-blue glasses in clinic."
She explained: "Although blue light has certain health risks to human body, some blue light is good for health. More importantly, the current market chaos of anti-Blu-ray glasses is more of a gimmick of business marketing. It is not known whether some merchants' products can filter harmful blue light at 100% while retaining beneficial blue light. Even if there is, there is no sufficient clinical research conclusion. "
She said that the biggest source of blue light is sunlight, and the amount of blue light on the screens of mobile phones, computers, tablets and other electronic devices is far less than sunlight, and it will not be more destructive than blue light from the sun. Whether it is a computer, a mobile phone or a tablet computer, the night mode of an electronic device can basically adjust the blue light of the device.
Cui Dongmei also pointed out that the decline of children's vision is more caused by the occurrence and development of myopia and the increase of corneal astigmatism caused by long-term close-up activities, rather than the so-called blue light. Some people feel comfortable wearing anti-blue glasses, probably because the blue light in the light is filtered out, and the light will become softer and less irritating, which will alleviate some people who are sensitive to strong light, so we don't recommend everyone to use anti-blue glasses.
interconnection
Ophthalmologist: Is long-term strabismus a sign of myopia, pseudomyopia or reversible?
Online classes at home for several months, is the child nearsighted? On May 1 1, a mother in a second-grade parent group of a school said, "I have taken my children to check my eyesight these days, and I have no reserve for farsightedness. I will be nearsighted for half a year at the earliest ... "Another parent immediately went on to say," My family is nearsighted. The examination last semester was mild, so I don't need glasses. I have to check again after half a year, and I have to attend online classes for several months. " Most parents believe that children are playing games and watching TV with electronic devices, and there is no outdoor activity during the epidemic.
"Under normal circumstances, after the child is born, both eyes are in a hyperopia state of about 200 degrees. With the growth and development, the anterior and posterior diameter of the eyeball is correspondingly prolonged, hyperopia is gradually reduced, and vision is gradually normal, and it develops to orthomorphism. " Cui Dongmei told reporters that hyperopia reserve is the refractive state of children corresponding to their age. For example, for a child of six or seven years old, his hyperopia reserve should be+1.75 to+2.00d; Hyperopia reserve of 9-year-old children+1.25d; 1 1 year-old children still have a hyperopia reserve of +0.75D. If children aged six or seven have hyperopia of+0.75d or children aged nine have hyperopia of +0.50D, it means that their hyperopia reserve is insufficient.
"Farsightedness reserves are insufficient. If you don't pay attention to your eyes, you will be prone to myopia in the next step. " Dr. Cui Dongmei reminded that long-term squinting may be a sign of myopia, and parents should pay attention to it.
She reminded that children go to class online at home and use too many electronic devices. If they go to the hospital for examination and find myopia, it may be true myopia or pseudomyopia. After pseudomyopia, if you still don't use your eyes well, you may become true myopia. At this point, it is irreversible.
What is pseudomyopia? In fact, the definition of pseudomyopia is not standard. Clinically we call it accommodative myopia. This situation generally occurs in children or adolescents, and the symptoms are mainly the decline of naked eye vision to varying degrees. However, after mydriasis optometry, the refractive state of the eyes is hyperopia or emmetropia, so it is called pseudomyopia.
Why is there pseudomyopia? This is because long-term close work will lead to excessive tension or even spasm of ciliary muscles, the suspensory ligament will not relax, and the refractive power of the lens will remain at a high value. When you look far away, the light will fall in front of the retina after refraction, resulting in myopia.
The process of pseudomyopia is reversible at first. As long as you use your eyes correctly and reasonably, take a proper rest, or take some eye drops to relax the ciliary muscles every night, you can gradually return to normal. However, if we still don't pay attention to good eye habits, continue to use our eyes at close range and don't pay attention to rest, it will cause the rapid growth of the axial length and become true myopia. At this time, you need to wear a pair of glasses. Experts pointed out that under normal circumstances, wearing myopia glasses can not only reduce the tension of ciliary muscles, but also correct vision.
suggestion
Keep your eyes off the screen every 20 minutes.
Cui Dongmei said that ophthalmologists suggested that the position and brightness of computer monitors should be adjusted when surfing the Internet at home. Keep the distance between your eyes and the computer screen between 50 and 60 cm. The computer center is about 15cm below the eyes. The font of the display screen is enlarged, so you can see clearly without squinting, and the brightness of the screen is not dazzling, so it is easy to see. It is recommended that children write, read and rest in places with natural light such as balconies and windows.
Children should have correct posture when reading and writing. Don't read on your stomach or lying down. Generally, after reading, writing or watching mobile phones and computers for 20 minutes, look up at the distance for at least 20 seconds; Or take a break after reading and writing for 30 minutes 10 minutes.
Besides surfing the Internet, try not to play video games or watch TV or play mobile phones for a long time. If you have symptoms of asthenopia or dry eye, it is suggested that besides hot compress before going to bed at night, you can also use artificial tears without preservatives to relieve symptoms. It is also important not to rub your eyes to avoid increasing corneal astigmatism. The last point is a balanced and nutritious diet. Parents should prepare more vegetables and fruits rich in vitamins for their children and reduce the eating habits of high fat and high sugar.