pupil size
Eye opening measurement
Pupil size refers to the diameter of the pupil—the dark opening at the center of the eye that regulates how much light reaches the retina.
Pupils dilate in darkness and constrict in bright light.
Beyond this reflex, pupil size responds to arousal, interest, cognitive effort, and certain drugs: Her pupils were dilated from the medication.
Researchers study pupil size as a window into attention and emotional state.
- dilationWidening of an opening
- constrictionTightening or narrowing action
- irisEye's pigmented disc
- eyeOrgan of sight
- lightVisible electromagnetic radiation
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- eyesblue eyes, brown eyes, green eyes, hazel eyes, amber eyes
- eye testseye exam, eye chart, vision test, eye test, eye tests
- eye surgeryLASIK, cataract surgery, PRK, vitrectomy, corneal transplant