What does the blue light emitted from a device screen mean?

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Pavel Yosifovich
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Most people spend hours in front of the screens of their electronic devices without thinking about the risks that the blue light emitted by these devices can cause; or even many don't even know that their devices emit blue light. This article will explain what does the blue light emitted from a device screen mean? and what dangers this light causes.

What does the blue light emitted from a device screen mean?

The sun is the main source of light and exposure to that light, without excess, is usually beneficial to health. But in this article we will talk about the artificial blue light emitted by electronic devices, such as smartphones, tablets, lamps, laptops, televisions and monitors; which is highly energetic e harmful to health.



The light emitted by these devices may appear white at first sight and this is because it is composed of different colors that give the impression that it is white; but the reality is that this white light is made up of about 25% blue light.

So the blue light I am electromagnetic particles traveling in waves; There are two types of light blue, turquoise and purple. The latter (purple) is the one present in electronic devices, and is the most harmful because it has a wavelength from 380 to 450 nm.

As blue light waves are short, have higher energy; therefore they cause severe damage to eyesight. The energy of blue light penetrates directly into the retina because the eye does not have a filter designed to prevent the damaging effects of this light.

Risks produced by the blue light emitted by the screens of electronic devices

  • Age-related macular degeneration (AMD); disorder that slowly destroys vision. Although this disorder is associated with age, the use of electronic devices increases the risk of suffering from this disorder.
  • Fatigue and visual stress which can also cause headaches, dry or watery eyes, red eyes, among others.
  • Stops the sleep cycle; Being exposed to blue light for long hours at night reduces the production of melatonin, a hormone responsible for telling the body it's time to sleep. When this hormone decreases, users suffer from insomnia.
  • skin damage ; to the point of causing premature aging or blemishes on the skin.
  • Cataract formation
  • It accelerates the process of blindness in some individuals.
  • Some experts say it increases the risk of cancer.

Tips for avoiding damage from exposure to this type of light

  • Wears glasses designed to block blue light while using the devices. These glasses are available in various stores including Amazon or AliExpress.
  • Activate dark mode on your Android, iOS and any other screens you use during the day from 19pm. If they are not available, many apps also have a dark version. Also find out if your computer or TV has filters to attenuate this light.
  • Reduce the time you spend using these devices, it is recommended that you spend a maximum of 6 hours a day in front of these devices.
  • Eat foods rich in antioxidants; among these we can mention kiwi, orange, zucchini, pumpkins, melon, mango, among others.
  • Reduce the screen brightness of all your Android, iOS and any other devices you use, especially at night.



  • To reduce eye strain when using your PC or cell phone, try to lubricate your eyes naturally by blinking constantly.
  • Many specialists recommend the use of sunscreen if you spend many hours in front of the screen of a device such as a PC, laptop or TV.
  • If you have a mobile of this brand, you can activate the visual rest mode or the night mode in Huawei.
  • Use your tablet or smartphone a safe distance from your face.

Electronic devices are needed today, which is why we are all exposed to the blue light they emit on a daily basis. While it is difficult to avoid the use of this equipment, we can take steps to reduce the risk caused by the blue light emitted from a device.



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