Three or five years later, the explosion of blindness in the eye_ If you don't understand, it's too late! recently
Three or five years later, the explosion of blindness in the eye? If you don't understand, it's too late! recently
An article circulated on the Internet "Alert: Blindness will break out in three or five years!" The post pointed out that due to the over-reliance of modern people on electronic products such as smartphones and computers, high-frequency blue light in the screen will greatly increase people's risk of eye diseases.
Is the harm of blue light so terrible? How to effectively protect against blue light in life? What is Blu-ray? Light is divided into two categories: visible light and invisible light, of which visible light refers to the spectrum that can be perceived by human vision, mainly including red, orange, yellow, green, cyan, blue, and violet. Blue light is a kind of visible light, with a wavelength between 400 and 500 nanometers, and the color that our human eyes perceive is blue, so this band of light is called blue light.
Because the wavelength of blue light is relatively short, the energy is higher than that of red and green light, and it can penetrate the lens directly to the retina. However, blue light is not always harmful, and blue light with wavelengths within 415-455 nanometers has been shown to damage the retina in some animal experiments.
Blue light between 455 and 500 nanometers is beneficial, playing an important role in regulating circadian rhythms, producing scoretic vision, and influencing refractive development. In daily life, all kinds of bath bombs, flat panel displays, fluorescent lamps, liquid crystal displays, mobile phone screens, LED lights and other new artificial light sources and visible light emitted by sunlight all contain blue light. Does blue light increase the risk of retinopathy? Blue light does damage vision to a certain extent,
The French National Health Security Agency has warned: "Long-term, close-range, repeated exposure to LED light beams containing large amounts of blue light may increase the risk of cataracts and lesions on the retina due to cellular oxidative stress".
However, researchers in France also say that blue light is present in all white light, including sunlight. If the blue light of the screen is harmful, then these hazards are insignificant compared to sunlight.
Liu Hongwei, an associate researcher at the Beijing Institute of Ophthalmology, wrote in "Is "Blue Light" So Terrible? In general, our body has a protective mechanism against photodamage. In addition to the cornea and lens absorbing some of the light, changes in the pupil also have a protective effect. When a large amount of light enters the eye, the pupil will shrink, and when the light is weak, the pupil will dilate.
In addition, our organism has an antioxidant system that protects us from damage. Fundus lesions occur only when too much light enters the eye, or when the light is exposed for too long, and the body's antioxidant capacity is weakened. Prolonged exposure of the eye to high-frequency blue light can damage the retinaExperts stress that the dangers of blue light should not be exaggerated.
In fact, only prolonged exposure to high-frequency, high-energy blue light can damage the retina. And this kind of blue light excess environment is still different from the environment in our daily life, so blue light should not be equated with "retinal damage".
1.56 Anti-blue light computer mobile phone radiation spectacle lens In fact, because the human eye itself has a certain ability to protect against blue light, most of the blue light will be filtered out by our macular pigment and lens. However, people who do not filter the lens well, i.e., pre-pubertal children, people who have had cataract surgery, and the elderly who have less macular pigment accumulation, need to be more vigilant and protect against blue light.
Can blue light cause macular degeneration? Expert: The reasons are complicatedIn addition, for the rumors mentioned that "blue light can cause macular degeneration", Liu Hongwei believes: "The causes of age-related macular degeneration are complex, and blue light is only one of the factors, so it is not advisable to prevent blue light alone. We should know that not only blue light, but all light can cause damage to our macula, and we should stay away from too much light and no unnecessary light."
How to protect against the hazards of blue light in life? Experts suggest that if you want to protect yourself from the hazards of blue light in life, on the one hand, you should pay attention to the light source in your life to avoid your eyes being exposed to excessive light; Indoor lighting should not be too bright; Wear sunglasses or color-changing glasses when going out to avoid direct light into your eyes; When using the computer for a long time, you should dim the brightness of the screen, and close your eyes for a few minutes at intervals.
On the other hand, wear qualified blue-light blocking glasses under the guidance of a doctor. At present, there are two main types of anti-blue light glasses on the market, one is to coat the surface of the lens with a coating that can reflect short-wave blue light, which can block about 15% to 35% of the harmful blue light lenses colorless and transparent; The other is to penetrate the pigment into the lens material by the method of osmosis, and the pigment absorbs blue light, and the anti-blue light effect of this lens is better than that of the coated reflective lens, and the lens is light yellow.
However, people in need should be wary of excessive marketing by sellers when choosing glasses, and choose products with qualified quality and specifications. At present, the blue light blocking glasses on the market are flooded with a large number of products that do not meet the reference standards, and some lens sample packaging labels do not meet the requirements.
For people with healthy eye function, the key to eye protection is not to wear blue-light blocking glasses, but to control yourself to avoid staring at electronic devices for long periods of time.