Recently, due to the impact of the new coronary pneumonia epidemic, many large, middle and primary schools continue to use online methods for teaching. Because online teaching requires students to use mobile phones, computers and other electronic products for a long time, it has a greater burden on students' eyesight. Glasses, anti-blue light film and other products.

  So, is blue light harmful to eyesight? Do anti-blue light products have the effect of preventing myopia? How to choose electronic products scientifically? What are the precautions when using electronic products? The China Consumers Association sorted out the opinions of relevant experts and the comparative test results of the Consumers’ Association. It issued a consumer reminder on July 13 to remind consumers that the blue light of electronic products is not the "culprit" that causes myopia. Myopia is harmful.

Blue light exposure for sufficient time and intensity may cause retinal damage

  With the popularity of mobile phones, tablet computers and other electronic products and the increasing myopia rate of children and adolescents, coupled with the hype about the hazards of Blu-ray, many parents blame Blu-ray for the "criminal culprit" of myopia in children.

  However, according to the China Consumer Association, blue light only has the potential to cause retinal damage, which is related to the blue light dose received by the retina. In other words, blue light irradiation can only cause retinal damage after reaching a sufficient time and a certain intensity.

  Some experts pointed out that the main damage to the eyes caused by blue light may cause macular lesions on the fundus, but this is caused by long-term, high-intensity irradiation. The medical community currently believes that the main factor affecting macular degeneration is age, not blue light.

  The China Consumers Association said that qualified electronic products have filtered harmful short-wave blue light, and their blue light hazard values ​​are basically at a non-hazardous level. That is to say, the correct use of the blue light touched by mobile phones and tablets will not cause damage to the eyes. There is currently no direct evidence that blue light causes myopia.

Consumers should treat anti-blue light products rationally

  For some businesses, through false exaggeration of the performance of anti-blue light products, excessive interpretation of the hazards of blue light, and high-priced sales of anti-blue light products, the China Consumer Association said that consumers should be treated rationally.

  Many experts pointed out that there is insufficient medical evidence to prove that products such as anti-blue glasses can play a significant role in preventing and controlling myopia. On the contrary, due to the large number of anti-blue light products and the uneven quality of the products, if they are not properly purchased, they can easily cause damage to the children's eyes.

  Some experts pointed out that the current anti-blue light glasses mostly have the following problems: first, some products have no protective effect on short-wave blue light that damages the eyes; second, some products are completely shielded from blue light, that is, excessive protection; third, because anti-blue light lenses are mostly If there is color, it will cause a certain "color cast". If it is used for a long time, it will easily aggravate the visual fatigue.

  In 2019, the China Consumers' Association commissioned a professional testing agency to conduct comparative tests on mobile phones, tablet computers and TV sets sold in the market. The results show that all 13 samples are free of blue light hazards.

  But the test results also show that children and adolescents should not watch the electronic screen for more than 30 minutes at a time.

It is recommended to effectively control the time of eye use and maintain the correct eye position

  It is understood that the medical community has reached a basic consensus on the "culprit" that causes myopia in children and adolescents, that is, children and adolescents are mainly caused by long-term use of electronic products resulting in visual fatigue and improper posture, effectively controlling the time of eye use and maintaining correct The most important way to prevent myopia is to use the eye position.

  In order to scientifically guide the prevention of myopia in children and adolescents during the epidemic, the CDC organized the Anhui Medical University School of Health Management, the Beijing Center for Disease Control, the Shanghai Eye Disease Control Center, and the Peking University People's Hospital Eye Vision Center to develop and issue "Guidelines on the Prevention of Myopia during New Coronary Pneumonia in Children and Adolescents (Updated Version)" make clear requirements for the prevention of myopia during online learning and the prevention of myopia after returning to school. For example, limit the use time of electronic products for online learning, choose large-screen electronic products as much as possible, adjust the brightness of electronic products to avoid being too bright or too dark, place electronic products away from direct light, adopt correct reading and writing postures and maintain Appropriate viewing distance, etc.

  The China Consumers Association reminds children, adolescents and parents not to worry too much about the hazards of blue light to their eyes, not to blindly superstitiously declare the effects of myopia protection advertised in anti-blue light products, but to choose appropriate electronic products. At the same time, parents should pay more attention to their children's eye hygiene, use their eyes reasonably, and protect their eyesight.

(Reporter Wang Haiqiong)