What is blue light and how does it affect our vision?

what is blue light

Most of the people take the sense of vision for granted and don’t need any specific procedures, but actually, there is a lot to do if we want to have a healthy and durable vision, and to protect it from sickness and diseases. We all know, prevention of the eye from sicknesses is better than waiting for any problem to occur when (in many cases) it is too late.
Here we state ten of the most important advises to preserve the eyes and vision

What is blue light?

The visible light is consisting of seven various waves, namely red, orange, yellow, green, blue, dark blue, and purple, those gathered waves form the white light that we see. Each wave has a distinct power and a different wavelength; the longer the wave light increases its power decreases. The blue light has a short wave, consequently a high power. The light must contain a big amount of blue light in order to look white.

The blue light is used to illuminate the electronic devices’ screens, especially the laptops, because they consume a small amount of power (electricity) than the luminous standard lamps and because it makes the screen brighter, which facilitates the vision during the day and under the sunlight.

The sources of blue light

The blue light is not restricted only to screens. The sun is considered as the big source of the blue light, and the other sources of this light are; Fluorescent lamps and low power lamps, which emit the blue light more than the standard lamps.

The rate of the blue light emitted from the screens is considered small compared to that emitted from the sun, but the screens are closer to the eye. Besides, staring at screens is not only during the day, but it lasts throughout the day.

Some studies state that the effect of the blue light on the eye varies according to the age difference; for example, the children’s eyes are more delicate and sensitive to the blue light than adults, so the children’s staring at screens is more affecting than others.

The advantages of blue light

Despite the continual warnings of the harmful effects of the blue light, the exposure to it and especially the one emitted from the sunlight has many benefits, such as:

  • Being vigilant and active
  • Memory support and help to focus attention
  • Improve the mood
  • Organize the biological clock (sleep/wake cycle)

A new study states that the children who are not exposed to enough blue light during the day affects eye development and their vision and may lead to myopia.

Disadvantages of the blue light

Although the general belief which states that the extended exposure to the blue light emitted from the screens affects the eyes or lead to Macular Degeneration or blindness, however, many new studies find that this amount of the blue light is not enough to such harm. Still, it is less than the one we are every day exposed to outside. The same study indicates that the light emitted from the economic lamps at home during the night is almost two times more than the one issued from the electronic devices’ screens.

Also, a study indicates that the discomfort or the pain that may hit the eyes after prolonged staring at screens is what we know as digital eye strain and which occurs because the long staring at screens leads to blinking for several times more than usual and this which causes dehydration and exhaustion of the eye.

Therefore, it is advisable to reduce the use of electronic devices as possible and not to stare at for long hours, take breaks, and use eye drops to hydrate the eye.

Although the blue light is not acquitted from accusations, studies show that the exposure to blue light during the night, causes troubles of natural sleep/wake cycle of the body, this leads to difficulties of sleeping, insomnia, and the sensation of fatigue; therefore, It is advisable not to stare at any screen at least two hours before going to sleep, moreover,  it is advisable to restrict the amount of the blue light emitted from electronic devices’ screens at night.

Originally published on Live Positively.

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