Dilated pupils mean that your pupils appear larger in size. The most common reason for dilated pupils is low light in a dark room since lower light causes your pupils to grow. Dilated pupils are also ...

Medically reviewed by Johnstone M. Kim, MD Key Takeaways The pupil controls how much light enters the eye, allowing for clear ...

The eyes are a window into our autonomic nervous system. Everyone's unique personal history and autobiographical experiences have the power to influence how and when the sympathetic nervous system ...

A function of the body that happens automatically without a thought, was considered to be impossible to replicate at will. Yet a 23-year-old student in Germany can shrink and enlarge his pupils on ...

Looking deep into your conversation partner's eyes isn't just for lovers — it has a place in the conference room, too. That's according to new research, which found that people are more likely to ...

Experimenting with mice, neuroscientists report new evidence that the eye's iris in many lower mammals directly senses light and causes the pupil to constrict without involving the brain.

People often mimic each other's facial expressions or postures without even knowing it, but new research shows that they also mimic the size of each other's pupils, which can lead to increased trust.

The differential diagnosis of mydriasis that is greater in bright light includes third nerve palsy, Adie's pupil, traumatic mydriasis, and pharmacologic mydriasis. In this case, third nerve palsy was ...