How Blue Light Affects Your Eyes

Rachel from ANRRI asks, “Do you sometimes find it hard to sleep at night?” Chances are that blue light is affecting your body’s biological clock and disrupting your sleep patterns. This is a reality for many people if you consider that an average modern human being spends almost 5,000 hours staring at screens that emit blue light.

It’s inevitable that as digital technologies continue to be available to more people, exposure to blue light will also increase. But what is blue light? Where can you find blue light? Is blue light good or bad for your eyes? If blue light has adverse effects on your eyes, what can you do to protect your eyes from these effects?

In this comprehensive article, ANRRI answers all the above questions. They look at how blue light affects your sleep patterns. More importantly, they provide some advice on what you can do to protect your eyes from the negative effect of blue light, particularly artificial blue light.

What is Blue Light?

When many people think about blue light, they think about the light that comes from the screens we interact with every day: television, smartphones, laptops, computers, and tablets. However, the reality is that blue light has always been around as part of natural light.

To understand what blue light is, we need to understand what light is made of. Light is a result of electromagnetic particles which emit energy as they travel in waves of different length. If you look at a rainbow, you will see that visible light is a combination of several colors, of which one is blue light.

The naked human eye can see only a small portion of the electromagnetic spectrum of light. This small portion has a wavelength range between 400nm and 750nm. The nanometer (nm) is the unit of measure for the electromagnetic spectrum wavelength. 

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