Healthy pupils dilate when looking at distant objects and constrict when looking at close objects.

“Healthy pupils are going to dilate when you look at something far away from you. Now, when you see something that excites you or stresses you out, your pupils also get big. Your eyes get wide. But if you look at something far away, your pupils are going to dilate. And when you look at things that are closer to you, when you move them up close, the pupils are going to shrink.”