ELI5: Explain Like I'm 5

Smooth pursuit

Smooth pursuit is like following a moving object with your eyes. Imagine you are watching a balloon floating across the sky. To keep watching it, you move your eyes to follow it as it moves. Your eyes can move fast or slow, depending on how quickly the balloon moves. If it moves quickly, your eyes move quickly. If it moves slowly, your eyes move slowly. This movement of your eyes to follow the moving object is called smooth pursuit. It's like a game: you try to keep following the balloon for as long as you can without losing sight of it. This game helps your eyes learn how to follow moving objects in the world around you.