Pupil magnification

Pupil magnification is when your eyes open wider, and more light can enter. It's like a window: The more open you make the window, the more sunshine you can see. In the same way, when your pupils open wider, you can see more things clearly. Imagine your eyes as having curtains, which can open or close. When they open, it's like opening the curtains to let in more light, and when they close, it's like closing the curtains to keep out light.