What is Blue light?

Blue light is a kind of light that you can see and feel when it shines on your eyes, like the sun or a phone screen.

Imagine you're playing with a flashlight in a dark room. When you turn it on, you see white light, but if you put a blue filter over it, only blue light comes through. That’s what happens with some lights, like your tablet or your mom's phone, they give off blue light, which is like that filtered flashlight.

When you look at something that gives off blue light, like a cartoon on your tablet, it feels bright and sharp, kind of like looking at a really shiny toy. That’s because blue light has tiny little waves that are short and fast, they zip into your eyes quickly.

Your eyes get tired when you stare at screens for too long, especially if they're full of blue light, just like how your arms get tired when you hold up a heavy book. But that’s okay, it's part of why we play and learn with all these fun gadgets!