There is a good chance you are reading this on a computer or phone screen. And there’s a good chance that screen is emitting blue light.

Blue light is everywhere. It’s in the sun and the stars. It’s in the sky and the water. It’s in your eyes and in your skin.

And it’s not all bad. Blue light is essential for our health. It helps regulate our circadian rhythm, keeps us alert and helps us stay focused.

But too much blue light can be harmful. It can cause digital eye strain, headaches and even sleeplessness.

That’s where blue light …