The colored part of the eye surrounding the pupil is called the iris. It automatically regulates the amount of light entering the eyes by regulating the size of the pupil. Light is the primary ...

"Why are eyes different colors?" asked a young patron at the Arlington Heights Memorial Library. The colored part of the eye is the iris, but whether it is brown, gray, hazel, or blue, eye color is ...

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 ...

How did people ever find the chemical that makes pupils dilate? Donald Mutti, a professor at the Ohio State University College of Optometry, eyes an answer to this query: The discovery was probably ...

Genetics determine the color of the eyes, which often darkens in the first few years of life. There are both temporary and permanent options for changing eye color. However, they may have risks. If a ...