Medically reviewed by Christine L. Larsen, MD Medications, trauma, and medical conditions can lead to abnormally small pupils ...

It's caused by inflammation in the uvea, a layer of tissue just inside the outer white part of your eye. The uvea is made up of a layer of blood vessels, a muscular ring that surrounds your pupil ...

A recent study observed sleeping participants' pupils during sleep, using a new method that could have implications for ...

For the first time, researchers have been able to observe how the pupils react during sleep over a period of several hours. A look under the eyelids showed them that more happens in the brain during ...

If evolution occurs through gradations, the critics say, how could it have created the separate parts of the eye -- the lens, the retina, the pupil, and so forth -- since none of these structures ...

MIT engineers have made a breakthrough in this area—they’ve developed a method to grow muscle tissue that contracts in ...

It was previously believed that our pupil size was only affected by three things: light, focusing on nearby objects and cognitive effects.

For the first time, researchers have been able to observe how the pupils react during sleep over a period of several hours. A look under the eyelids showed them that more happens in the brain during ...