Miosis

Miosis is a big word that means when your eye gets smaller. Imagine if you had a camera that could go from big to small. When your eye gets smaller, it's like the camera is zooming in really close.

Your eye has something called a muscle that can make it big or small, just like your hand can be opened or closed. When you're in a big, bright room, your eye might get very big - just like opening your hand wide because you're excited to see everything around you.

But, when it's darker outside or you're trying to focus on something small, your eye needs to get smaller - just like closing your hand a little bit so that you can pick up something small. This is miosis.

Sometimes, doctors will look at your eyes to see if they're working properly or if you have any problems. They might use some bright lights that make your eyes get really small quickly. This is to check how your eyes respond to different levels of light.