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 ...

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 ...

Dilated pupils (mydriasis) occur when the pupils open larger than usual. This normally happens in darker lighting to allow more light into the eye, but dilated pupils can also indicate an underlying ...

It is commonly known that pupil size fluctuates in response to brightness and darkness during wakefulness. What is less commonly known is that pupil size is also regulated by the autonomic nervous ...

One evening in 1960, the psychologist Eckhard Hess was at home, flipping through a book of “strikingly beautiful animal photographs.” His wife commented that the light in the room must be dim, because ...

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In case you've faced some hurdles solving the clue, Eye part that regulates pupil diameter, we've got the answer for you. Crossword puzzles offer a fantastic opportunity to engage your mind, enjoy ...