Dilated pupil. Enhanced image of a dilated pupil. The iris, a coloured muscular ring, regulates the amount of light that enters the eye through the pu

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Dilated pupil. Enhanced image of a dilated pupil. The iris, a coloured muscular ring, regulates the amount of light that enters the eye through the pupil (black). Low light conditions, sexual arousal and certain drugs can cause the pupil to dilate (enlarge).

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Size: 4370px × 4112px
Photo credit: © Science Photo Library / Alamy / Afripics
License: Licensed
Model Released: No

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