Is anti blue lens really effective? Businesses won’t tell you the truth

I believe that when you buy glasses, you have heard from the shop assistants that “anti blue light glasses” are good for your eyes. It seems that if you choose them, your myopia will get better. < / P > < p > you may have heard the saying that electronic screens produce blue light, and excessive exposure to blue light can lead to a series of eye problems, such as dry eye disease, visual fatigue, sleep cycle disorder and fundus macular degeneration. The sun is the main source of blue light. Of course, LED screen, computer screen and mobile phone screen will emit blue light. So should we cut off the blue light that’s blocking these screens? < / P > < p > first of all, most of the blue light protection products are still in the stage of “believe me, you will live forever”. All kinds of threats, it seems that if you look at a mobile phone at night, you will be blind. Among the negative effects of blue light on human body, there is only one kind with sufficient evidence, that is, the effect of night cold color light on human sleep cycle. < / P > < p > in the evening, playing games, chasing dramas, watching small videos and reading, we spend more and more time using mobile phones, and the cold color light emitted by the screen will have an impact on the human body, making the viewer keep relatively excited all the time, which will reduce the quality of sleep. < / P > < p > many sleep experts advise us not to play with mobile phones 2 hours before going to bed However, it is really difficult for ordinary people to do so, so, start to reduce the cold color light. < / P > < p > reduces the intensity of all the light on the screen, and the intensity of the cool part naturally decreases. The automatic brightness adjustment function of mobile phone can automatically adjust the brightness according to the change of ambient light, which can effectively reduce the brightness difference in the environment, not only can let us sleep better, but also can reduce eye fatigue. < / P > < p > most people will unconsciously reduce the number of blinking while watching the screen, resulting in visual fatigue and dry eyes, which has nothing to do with the blue light on the screen. To alleviate these symptoms, it is recommended to use the following principles when looking at a computer or mobile phone: < / P > < p > sit about 25 inches in front of the computer screen. Adjust the screen to a slightly downward gaze angle, because this can reduce the area of the eyeball exposed to the air and avoid dry eyes caused by rapid evaporation of tears. Use the “20-20-20” rule to take regular breaks: every 20 minutes, look at objects 20 feet away for 20 seconds. When your eyes are dry, try using a humidifier to increase ambient humidity, reduce the rate of tear evaporation, and use artificial tears. If you have to turn off the lights on your computer screen, you can’t see more clearly than if you have to turn off the lights. < / P > < p > therefore, the eye symptoms that appear after watching the electronic screen for a long time have nothing to do with blue light, and there is no need to buy anti blue light glasses. If you want to minimize the impact of blue light on sleep, the most reliable way is to control the use of electronic products, and moderation is always the best. Focus