The size of your pupils varies throughout the day, but most people’s pupils fall within a particular size range. We’ll look at when and why your pupils change size. First, the range of “normal” pupil ...

“The effect was so strong, we knew immediately that we were onto something important,” recalls Nikola Grujic, a postdoc in the Neurobehavioural Dynamics Laboratory at ETH Zurich. Through a series of ...

You look in the mirror and notice that the dark circles in the middle of your eyes are bigger than usual. What's going on? Those dark circles are your pupils, the openings that let light enter your ...

Medically reviewed by Diana Apetauerova, MD Key Takeaways Anisocoria is when the pupils of your eyes are different sizes.

Our eyes are more than just windows to the world—they're also mirrors to our minds. Here is an interesting fact that you will ...