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

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 Andrew Greenberg, MD Key Takeaways Eye dilation usually lasts four to six hours, but it can last longer ...

His gaze softens as he draws closer to you. With one hand around your waist and the other cradling your jaw, he pulls you in. You look into his eyes, and notice his pupils have grown large and hungry.

Pupil dilation may signal deception. The autonomic nervous system regulates pupil size. Pupil dilation normally indicates an increase in cognitive demand. Liars usually experience an increase in ...

The pupils of our eyes get larger when we are focusing on a task–and the size may give clues about our working memory capabilities, a new study has found. A person's pupils dilate in low-light ...

Pupils are the black circles located in the center of your iris, or the colored part of your eye. The pupil allows light to enter your eye and often changes in size. When your pupils appear larger, ...

From a scientific perspective, it may sound a bit too fanciful to call our eyes “windows to the soul.” But research suggests that looking into them can, quite literally, offer a peep into a person’s ...

The iris is a structure behind the transparent cornea of the eye. It has a circular opening called the pupil that changes size in response to the light level. Your pupils are usually the same size as ...

At my job, I'm going to be working with a new laser soon, and as such, I have to pass some certifications to become a laser operator. One of the requirements is that I take an eye exam to determine if ...

The PERRLA test is a standard eye examination that can help healthcare professionals diagnose a wide range of health issues, including vision problems and some neurological conditions. People may ...