Do Cell Phones Emit Blue Light?

Have you ever considered that do cellphones emit blue light? Nowadays digital products have become an indispensablerole in people's lives. However, behind these lovable technology products,there is also a hidden problem of blue light on the screen that may harm theeyes. Recently, there is a popular saying on the Internet that turning thephone screen to black and white mode can prevent blue light, thus achieving thepurpose of eye protection. Is it really a good thing to kill two birds with onestone? Yesterday, the reporter interviewed the local ophthalmologist.

Scientists explore do cell phones emit bluelight. The reporter experience cell phone screen a key to become black andwhite.

Yesterday, the reporter in accordance withthe tips posted by netizens, the phone into full color blind mode, the screeninstantly turned into a black and white gray world: color APP icons into blackand white, photo albums show black and white effect, randomly click on a shortvideo, just like watching a black and white film. Some experiments to verify docell phones emit blue light.

But the black and white mode is only thedisplay effect on this phone, use it to take pictures, shoot video aftersharing to others, the other phone to see is still the color photos and videos.

In black and white mode, the reporteropened the take-out platform ordering page, all dishes are black and white,lost the original attractive color, a time quite uncomfortable. On theInternet, some experienced black and white mode netizens flirt: "Afteropening the phone black and white mode, outside to show the health code areblack and white color, a little embarrassing." There are also netizenssaid, I do not know if it really works, try it first.

Experts say black and white screen can notprevent blue light. So, do cell phones emit blue light?

It is understood that blue light is part ofthe visible light, visible everywhere in our lives. However, some digitalproducts produce too much blue light, especially the 400 to 450 nanometers ofhigh frequency, high energy short-wave blue light, is the ability to penetratethe cornea and lens, causing damage to the retina and the macula of the fundus.

Can a black and white cell phone preventblue light? Zhou Chao, director of the optometric center of Wuhan University'sAier Eye Hospital, said that after adjusting the phone screen to black andwhite mode or dark mode, the bright blue light will still be emitted. No matterwhich mode, it is exactly the same amount of blue light emission. When in darklight for a long time, the pupil will be dilated, which may cause more damageto the eye, and may lead to glaucoma if the pupil is in a dilated condition fora long time.

In addition, people think that the use ofblack and white or dark mode can protect the eyes, which will instead allowpeople to recklessly prolong the use of cell phones, which will cause moredamage to the eyes in the long run.

Anti-blue light glasses can not be worn fora long time.

In addition to the phone into various modesof anti-blue light, the market also appeared a variety of anti-blue lightproducts, such as anti-blue light glasses claim to "block the harmful bluelight issued by electronic products" "to relieve eye fatigue",and even "to prevent Myopia", by many people hot.

In this regard, director Zhou Chao said,theoretically, excessive exposure to high-energy blue light may cause damage tothe eyes, but the premise is excessive exposure and blue light is high energy.In fact, not all blue light is harmful, and not everyone is suitable to wearanti-blue light glasses.

Specialized anti-blue light glasses canisolate ultraviolet light and radiation, and can filter blue light, for peoplewho use electronic products for a long time, anti-blue light glasses can indeedblock some of the harmful blue light damage to the eyes. But it is worth notingthat usually anti-blue light glasses lenses are yellowish, and will form a highblocking blue light, if worn for a long time, easy to cause color bias, plusattention to fatigue. Especially for the youth group, the increase in visualfatigue will not only not control myopia, but will accelerate the progress ofmyopia. In addition, some parents have the misconception that "anti-bluelight glasses can control myopia", so they let their children useelectronic products without guidance and control, which will also somehowaccelerate the progress of myopia in children.

Zhou Chao, director of the best way toavoid blue light damage from electronic products is the "20-20-20"rule, that is, for every 20 minutes, look at least 20 feet (6 meters) away fromthe object for 20 seconds. At the same time, but also to increase the child'soutdoor exercise time.