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Our daily life is inseparable from computers, mobile phones and other electronic products. These high-tech achievements not only bring more convenience and fun to people, but also bring with them symptoms such as eye fatigue, deeper myopia, headaches and insomnia. “The high-energy short-wave blue light emitted by electronic products is the culprit responsible for dry eyes, astringent eyes, and eye fatigueâ€. The anti-Blu-ray glasses were born and sold well. The reporter visited a number of optical shops and found that anti-blue lenses were sold. On the Internet platform, the sales of a certain anti-blue eyewear brand have reached more than 2,000 in monthly sales. However, in the more than 10,000 reviews, the experience of consumers has been very different. Some people feel that they are “not so tired†and others think that “they have no effect at allâ€. Blu-ray glasses in the end there is no use, is not it necessary to wear it?
The electronic display mainly emits blue light. The human eye has certain adaptability to blue light.
"Blu-ray belongs to the visible light range and has a wavelength between about 400 nanometers and 500 nanometers." According to Chen Yueguo, chief physician of ophthalmology at the Third Hospital of Peking University, natural light consists of spectra of different colors, and different wavelengths are visually presented. Different colors, the shorter the wavelength, the higher the energy, short-wave blue light belongs to the light with higher energy.
Most of the light emitted by the display screens of lighting, mobile phones, and computers that we use today contains blue light. The data show that, unlike visible light, which contains seven colors of red, orange, green, blue, and purple, light emitted from displays of LEDs used in electronic products mainly consists of three colors: red, green, and blue. Accounted for the main part.
Chen Yueguo believes that, under normal circumstances, after evolution, human eyes have become adaptable to Blu-ray. But in recent years, due to people's long-term use of electronic products, triggering concerns about whether blue light harms the eyes. “One reason people are worried about blue light is the recent medical research on macular degeneration in the elderly.†Because studies have pointed out that if the blue light irradiation time is too long, after the age of 50, the human eye's macula tends to have a degeneration tendency. Macular degeneration will weaken the function of the retinal pigment epithelium, even causing bleeding, resulting in decreased central vision.
Chen Yueguo said that the macula is an important part of the eye and it is a subject that the medical community is currently concerned about whether Blu-ray is harmful or not. However, there is no conclusion yet.
The lack of conclusive evidence on the human eye does not hurt the eyes and the intensity of time
In 2014, the Visual Reproductive Research Laboratory of China National Institute of Standardization and the Retinal Regeneration Medical Research Group of Wenzhou Medical University published articles on blue light for retinal damage in "Molecular Cell Biology." The experimental results show that the peak blue light spectrum is in the range of 460-500 nm, and the illuminance exceeds 1500 lx (lux, illuminance unit) or more, and direct directivity for more than 3 hours will result in significant cell viability and apoptosis.
“It should be noted that the influence of blue light on the eyes needs to be considered in combination with the two factors of illumination and time.†Chen Yueguo introduced that the regular electronic products used in daily life have undergone rigorous standard inspections. Most lamps and lanterns have their light sources encapsulated and displayed. The screen mostly uses backlight or sidelight display, and its illumination is much smaller than experimental data.
Although there are experimental data showing that blue light damages the eyes, Chen Yueguo stressed: “Now the effect of blue light on photoreceptor cells and retinal cells is based on experiments conducted on animals and cultured cells. There is no evidence that blue light requires much illumination and Time can cause damage to living human eyes."
"The existence of blue light is reasonable." Chen Yueguo said that blindly filtering out blue light is also likely to cause a decrease in visual acuity for the elderly.
High blocking rate causes color shifts that make eye fatigue easier to wear after incontinence
Engaged in the IT industry for a long time to the computer, the children always watch TV at home, hold mobile phone chase all day ... ... consumers choose to use anti-Blu-ray glasses for a variety of reasons. But do you think the glasses you bought are really against blue light?
Cai Jianqi, director of the Visual Health and Safety Protection Laboratory at the China National Institute of Standardization, introduced that the anti-blue glasses on the market are mainly used to block or absorb blue light through special materials. At present, there are two misunderstandings in Blu-ray protection. One is the place where the defense is not protected, and the other is the increase of visual fatigue due to color misalignment caused by false protection.
Cai Jianqi said that studies have shown that our eyes are most intolerant to the blue light in the 400-440 nm band, so today's manufacturers mainly block blue light in this band when producing blue-light-proof glasses. But the electronic products that we are currently in contact with, the blue wavelength band that it produces is between 450 nanometers and 490 nanometers, and the anti-blue light glasses are almost unprotected in this band.
"Blu-ray glasses, the blocking rate of 20% -30% on it." Cai Jianqi said that the current market blocking rate of blue-ray glasses basically reached 80% -90%. However, the band of protection is not protected, and the high blocking rate also causes color shift, which is more likely to cause eye fatigue.
Xu Jiajun, director of ophthalmology at Dongzhimen Hospital of Beijing University of Traditional Chinese Medicine, said that anti-blue glasses belong to spectacles, the quality of their lenses can not meet the clinical standards for artificial lenses, and the country has not issued relevant manufacturing standards, resulting in the current production of anti-blue lenses. Process and product quality are uneven. In September this year, the Wuhan Bureau of Quality Supervision conducted an anti-blue light performance test on the blue-ray anti-glare glasses on the market. Among the 30 batches of anti-blue resin lens samples collected, 15 batches of samples did not have anti-blue light effect.
Chen Yueguo, who has been conducting refractive studies for many years, said that he never actively recommends patients to wear anti-blue glasses. He also does not advocate the use of anti-Blu-ray glasses as "amulets," and indiscriminate use of the eyes after wearing them. He pointed out that in the northern winter when the air is dry, normal people do not use computers, mobile phones and other products, the eyes will appear dry, so reasonable use of eyes and eye protection is more important than wearing anti-blue glasses.
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