Light is made of a range of wavelengths some can be seen by the human eye(visible light) and some not seen. The human eye is only sensitive to visible light. Visible light is that part of the spectrum that is seen as colors. Blue light has a very short wavelength, high amount of energy. Studies suggest that, over time, exposure to the blue light can cause severe long-term damage to your eyes.

You’re exposed to it when you watch TV, shop on your tablet, text your friend, respond to work emails on your computer or sit at your desk beneath an energy-efficient bulb. You’re even exposed to it when you spend time outside in the sun. Blue light is everywhere. And short of ditching all digital devices, there’s no way to avoid being exposed to it in high doses.

But what exactly is blue light? And why is it different from other types of light?

Blue light is the harmful light waves that are emitted from sunlight and devices

Well, before you can understand what blue light is, you need to understand that all light is a form of electromagnetic radiation. Some types of electromagnetic radiation can be seen by the human eye, while others can’t That means there are certain types of light you can’t see.

All light —visible and invisible— is categorized on the electromagnetic spectrum by wavelength. The longer the wavelength, the less engergy the light has. In contrast, the shorter the wavelength, the more energy the light has. Visible light also exists on a color spectrum from violet to red. Violet light contains the shortest, highest-energy wavelengths, and red light contains the longest, lowest-energy wavelengths.

Since it falls close to violet on the color spectrum, blue light is among the higher energy, shorter wavelength forms of light around. Unfortunately, shorter wavelength light is harder on your eyes. That may explain why, over time, exposure to the blue light can cause damage to your eyes and even increase your risk of diseases like macular degeneration.

Luckily, there are ways to protect yourself from blue light. You can decrease your exposure somewhat by reducing your use of digital devices. You can also support eye health and protect your eyes from blue light by getting enough of the antioxidants lutein, zeaxanthin, and meso-zeaxanthin. Studies show these three antioxidants can increase levels of macular pigment in your eye, and macular pigment helps shield your eyes from blue light.

By reducing your exposure to blue light when possible and supporting your eyes with the right nutrients, you should be able to keep your eyes safe from the dangerous side of blue light.