Why do some people need glasses and others don't?

Some people need glasses because their eyes have trouble focusing, just like some kids have trouble seeing things clearly from far away or up close.

Your eyes are like cameras that take pictures of the world. When you look at something, your eye adjusts so the picture is clear. If your eye can't adjust well, the picture might be blurry, like when you try to read a book in a dark room.

Some people’s eyes are more like old cameras that need help focusing. That’s why they wear glasses, the glasses act like a helper that makes the pictures clearer, just like a flashlight helps you see better in the dark.

Other people have eyes that work really well, like new cameras, so they don’t need any extra help. It's all about how your eye adjusts when looking at things close or far away, some eyes do it easily, others need a little help from glasses!