What are pupil dilates?

Pupil dilates are when your eyes get bigger to let more light in, like a door opening wider so more people can come in.

Imagine your eye is like a room, and the pupil is the doorway. When it's bright outside, the doorway stays small, letting just enough light in for you to see clearly. But when it gets dark, like when you go from playing outside to reading in bed, the doorway opens up, that’s when your pupil dilates, or gets bigger.

Your eyes have special helpers called iris (like a colored curtain), and they control how big the pupil gets. When it's dark, those helpers say, “Let more light in!” so the doorway opens wide, just like when you pull open a big blanket to let more sunlight into your room.

When it’s bright again, the helpers say, “Okay, enough light,” and the doorway gets smaller again, just like closing that blanket. That's how your eyes adjust to different lights all day long! Pupil dilates are when your eyes get bigger to let more light in, like a door opening wider so more people can come in.

Imagine your eye is like a room, and the pupil is the doorway. When it's bright outside, the doorway stays small, letting just enough light in for you to see clearly. But when it gets dark, like when you go from playing outside to reading in bed, the doorway opens up, that’s when your pupil dilates, or gets bigger.