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

You have probably heard the saying that the eyes are the windows to the soul, but now it turns out that they are also connected to how we breathe. Scientists have long studied the size of our pupils ...

The pupillary light response helps our eyes see the world around us in various lighting conditions ranging from bright, sunny days to dark, moonlit nights. Like a camera's aperture, this adaptive ...

The way the brain regulates pupil size is different from previously thought: fundamentally responsible is the neurotransmitter orexin, as researchers at ETH Zurich have now shown. This discovery could ...

Arousal is a fundamental part of how our brain keeps us alert, engaged, and responsive to the world around us. It is controlled by networks deep in the brainstem, like the locus coeruleus (LC), which ...

Medically reviewed by Johnstone M. Kim, MD Key Takeaways Mydriasis is when the pupil stays wide and doesn't respond to ...

UNDATED (WKRC) - Pupil size is related to intelligence. That's according to a study published in Scientific American, with work conducted at the laboratory at the Georgia Institute of Technology.

When people are awake, their pupils regularly change in size. Those changes are meaningful, reflecting shifting attention or vigilance, for example. Now, researchers reporting in Current Biology on ...

A compelling study has found pupils respond in the same way to the number of objects in one’s field of vision as they do to light. Experiments revealed pupils dilate in response to images with larger ...

Pupils are a rich source of social information. Although changes in pupil size are automatic and uncontrollable, they can convey interest, arousal, helpful or harmful intentions, and a variety of ...

Scientists have discovered a link between pupil size during non-REM sleep and the processing of new and old memories. Understanding how pupil size relates to memory could have significant implications ...