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Is blue light really harmful for your eyes and not good for your eye health? You will get to learn everything about blue light and its impact in this article.
How blue light is created?
A major and natural source of blue light is the sun. However, the light is made up of all seven colors, which makes light white. Here comes the question: Does the sun directly give blue light, or how can we really say that the sun is the major source of blue light? So, the sun doesn’t give blue light directly, but when light from the sun scatters to the earth’s atmosphere, all the colors are emitted from the sun, but blue light has a short wavelength and high energy, which gets interacted with the particles in the air.
On the contrary, the major source of artificial blue light is LED, in which electricity passes through a semiconductor, which is usually gallium nitride, and then it releases light. LED releases blue light directly because gallium nitride, the semiconductor, creates blue light in a wavelength of 400-500 nanometers.
Some of the benefits of blue light
- Light that comes from the Sun involves blue light, as discussed, and is natural light; it regulates circadian rhythm, which is the internal alertness and the wake cycle of humans.
- Blue light can reduce the chances of seasonal affective disorder, which studies say you can get an effect from it in winter months when it is dark and silent.
- It helps to keep focus and stay alert making you productive.
- Blue light reduces the chances of myopia, which is nearsightedness.
- Blue light increases productivity and cognitive performance.
How does blue light affect sleep?
Devices like smartphones, computers, and tablets had LCDs, “liquid crystal displays. These devices depend on blue light. And before going to sleep, if you use any of the devices, it can fade away your sleep, affect the production of melatonin in your body, and due to which it is difficult to sleep at night.
What is melatonin?
| It is the hormone that the brain produces as a reaction to darkness, which helps in the internal body clock, by which the human brain gets signals to sleep at night at a certain time. |
How blue light causes computer vision syndrome?
Sitting in front of screens for long hours can cause computer vision syndrome, also known as digital eye strain. Studies say that these digital devices emit blue light, which causes eye fatigue, dryness of the eyes, blurry vision, and headaches. We all know the use of screens has increased heavily, and nobody can avoid it. So, sometimes it’s better to rest your eyes; you can use the screen in night mode or dark mode or apply anti-glare filters on your PC and lower the brightness of your devices.
There are some glasses, filters, and even software that can be useful for your eye health and can protect you from computer vision syndrome.
Conclusion
Blue light is not really harmful ,natural blue light, which is from the sun, is good for you. However, artificial blue light also has positive and negative impacts; it keeps you focused and productive in this light. The negative impacts are that it reduces the melatonin hormones and affects sleep, as our digital gadgets like phones, laptops, and tablets have LCDs that produce blue light, and before going to sleep, if using any of the devices, it can affect sleep.
Blue light also causes computer vision syndrome, which is due to excessive screen time. It can impact the eyes, causing eye dryness, fatigue, and headaches. To cope with it, It is important to use your gadgets in night mode or dark mode and use glasses for protection so you won’t need to see the screen directly.
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