What is blue light, and how does it affect your health?

| 16.12.2020

How to keep your eyes healthy after hours on the computer?


Back to school is here, and many of you have also returned from vacation (sorry, I do not want to put my finger in the wound), which means that we put neurons and muscles back to work, and many of us, to eyes that have to overcome whole days of exposure to computer waves again. In today’s blog, we have thought about those little forgotten ones who work tirelessly for us, our eyes, who day by day face hours of reading and viewing through screens, and how many times they only complain when they are exhausted. We will talk about blue light, how it affects us, and what we can do to improve your day-to-day eye health.


What is blue light?

Blue light is made up of the shortest wavelength electromagnetic waves in the visible spectrum. What does this tongue twister mean? Without going into overly technical physical issues, we can say that sunlight (also known as white light) comprises different electromagnetic waves that we can classify by their wavelength. Among them are all the visible ones (from red waves, with greater wavelength and lower energy, to blue, shorter, and more energetic ones, passing through orange, yellow, green, etc.) and the non-visible ones infrared, ultraviolet, microwave, etc.

Why is the blue light special for us to talk about?

All types of waves in the spectrum have their characteristics, some of them are beneficial to our health, but others can be harmful. In general, we can affirm that as in almost everything, the little is liked, and the much is tiring; that is, a minor is beneficial, but a lot can harm. For example, ultraviolet light makes us brown and helps us synthesize vitamin D, but it can cause burns or even skin cancer if we expose ourselves.

As for the blue rays, which are high-energy rays, we can cite different characteristics as we have already commented previously.


not necessary to continue sleeping
Effects of Blue light

Effects of Blue light:

Benefits of blue light (short exposures)

  • Raises the mood: when we are exposed to less sunlight, such as in winter, it is more common that we feel down without wanting to do things, and this mood changes in summer when the amount of light is more significant.
  • It is key to being able to perceive colors correctly and improves visual acuity: If we blocked all the blue light that we perceive, the colors of the objects around us would be altered, and we would not capture their differences as well.
  • Supports memory and cognitive function: blue light keeps you awake and “alert.”

It helps regulate the circadian rhythm of sleep-wakefulness: blue light informs our brain that it is daytime, and therefore, it is not necessary to continue sleeping.

Damages of blue light (long or too intense exposures)

  • ┬áThe risk of macular degeneration can increase blue light damage cells in the retina sensitive to light.
  • Increases eye fatigue: this type of high-energy wave has more dispersion than other visible light waves, and for this reason, it is more difficult to focus, so our eyes must work more, which causes fatigue.

It can lead to insomnia – actually, depending on how you look at it, this can be a benefit or a disadvantage of exposure to blue light. As we have discussed in the services, blue light regulates the sleep-wake rhythm. When our retina perceives blue light, it sends a message to the brain to keep us awake. The problem comes when we are receiving blue light at night (if we use screens before sleeping) since our brain interprets that it is not time to sleep, and when we’re at the bed, “No one blinks our eye.”

too intense exposures
Blue light filters and safety glasses

Blue light filters and safety glasses

All of us who use screens often (smartphones, tablets, computers, or television) are exposed to more blue light than we should. An excellent way to continue using these gadgets without damaging our vision or biological rhythms is to use blue light filters.

The glasses filter blue light is a kind of glasses whose lens is tinted slightly yellow. When you put them on, they don’t alter your normal vision, it doesn’t affect the color you see things with, but it helps your eyes receive much less of these waves. These glasses are sold without a prescription, and there are several types:

  • Glasses with the blue light filter (they work even if you wear contact lenses)
  • Glasses with blue light filter and magnification (for close reading)
  • Glasses with a blue light filter and corrective myopia, astigmatism, or hyperopia (you have to ask for them at an optician


If you want to purchase glasses to protect yourself from the harmful effects of blue light, you can visit www.Muunel.com and explore our collection of blue light protective glasses. We have products for both men and women of every age. Our designs are unique, according to the latest fashion trends. So, if you want some premium-looking eyewear, you must give it a try at Muunel.com.

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