Network transmission "turn the phone to black and white can prevent blue light", experts: as long as the screen is bright, blue light will exist

Jimu News reporter Liao Shiqi

Correspondent Pei Ni Xie

Video clip Liao Shiqi

Nowadays, digital products have become an indispensable role in people's lives. But behind these addictive tech products, there is also a hidden problem of screen blue light that can hurt the eyes.

Recently, there is a popular saying that the mobile phone can be adjusted to black and white mode to prevent blue light, so as to achieve the purpose of eye protection. Is there really such a good thing as killing two birds with one stone? On January 6, Jimu News interviewed local experts.

Reporter experience: The phone turns black and white after one-click opening

According to the prompts of netizens, the reporter turned the mobile phone into a total color blind mode, and the mobile phone screen instantly became a black, white and gray world. The color app icon becomes black and white; the photos in the album appear in black and white; and a short video is randomly clicked on, as if watching a black and white movie.

The black-and-white mode is just the display effect on this phone, when you use this phone to take pictures, take videos, and share them with others, the other party still sees color photos and videos.

In the black and white mode, the reporter opened the ordering page of the takeaway platform, and all the dishes were black and white, losing their original seductive color, and they were quite uncomfortable for a while. On the Internet, some netizens who have experienced the black and white mode joked: "After opening the black and white mode of the mobile phone, the health code shown outside is black and white, which is a bit embarrassing." ”

Experts say: Black and white screens are not blue-light-resistant

It is understood that blue light is part of visible light and can be seen everywhere in our lives. However, some digital products produce too much blue light, especially high-frequency, high-energy short-wave blue light of 400 to 450 nanometers, which has the ability to penetrate the cornea and lens, causing damage to the retina and the macula under the fundus.

Can the phone be black and white to prevent blue light? Zhou Chao, director of the Optometry Center of Aier Eye Hospital affiliated to Wuhan University, said that after adjusting the mobile phone screen to black and white mode or dark mode, bright blue light will still be emitted. Either mode, it is the same amount of blue light emitted. In low light for a long time, the pupil will be dilated, causing more damage to the eye, and if the pupil is dilated for a long time, it may lead to glaucoma. In addition, after using black and white or dark mode, everyone thinks that they can protect their eyes, but they will unscrupulously extend the use of mobile phones, which will cause greater damage to the eyes in the long run.

Anti-blue light glasses have a certain effect, but they cannot be worn for a long time

In addition to adjusting the mobile phone to various modes to prevent blue light, anti-blue light glasses claim to be able to "block the harmful blue light emitted by electronic products", "relieve eye fatigue", and even "prevent myopia", which has been warmly welcomed by many people.

Are anti-blue light glasses really an artifact of blue light? In this regard, Director Zhou Chao said that in theory, excessive irradiation of high-energy blue light may cause damage to the eyes, but the premise is that excessive irradiation and blue light are high-energy. In fact, not all blue light is harmful, and not all people are suitable for wearing blue-light-proof glasses. Special anti-blue light glasses can isolate ultraviolet rays and radiation, and can filter blue light, for people who use electronic products for a long time, anti-blue light glasses can indeed block some harmful blue light damage to the eyes. However, it is worth noting that usually anti-blue light spectacle lenses are yellowish, and will form a high block of blue light, if worn for a long time, it is easy to cause color casts and pay more attention to fatigue. Especially for adolescent groups, the aggravation of eye fatigue will not only not control myopia, but will accelerate the progression of myopia. In addition, there are also some parents who have the wrong understanding that "anti-blue light glasses can control myopia", so allowing children to use electronic products without guidance and control will also accelerate the progress of children's myopia to some extent. Director Zhou Chao introduced that the best way to avoid blue light damage in electronic products is the "20-20-20" rule, that is, every 20 minutes of looking, at least 20 feet (6 meters) away from the object for 20 seconds. At the same time, it is also necessary to increase your child's outdoor exercise time.