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What should you know about why your pupils look big?

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You look in the mirror and notice that the dark circles in the middle of your eyes are bigger than usual. What's going on? Those dark circles are your pupils, the openings that let light enter your eye so you can see. Muscles in the colored part of your eye, called the iris, control your pupil size. Your pupils get bigger or smaller, depending on the amount of light around you. In low light, your pupils open up, or dilate, to let in more light. When it’s bright, they get smaller, or constrict, to let in less light. Sometimes your pupils can dilate without any change in the light. The medical term for it is mydriasis. Medicines, injuries, and diseases can all cause this eye condition.

From: Why Do My Pupils Look Big? WebMD Medical Reference

SOURCES:

American Academy of Ophthalmology: "Pharmacologic Dilation of Pupil," "What Can Cause A Fixed Pupil?" "What to Expect When Your Eyes Are Dilated."

Benjamin, W., Borish, I. , Butterworth-Heinemann, 2006. Borish's Clinical Refraction

Headway: the Brain Injury Association: "Treatment and Recovery."

Lee, Andrew G., et al. Slack Inc., 2009. Curbside Consultation in Neuro-ophthalmology: 49 Clinical Questions,

Mayo Clinic: "Traumatic brain injury: Tests and diagnosis."

Moorfields Eye Hospital: "Anatomy of the eye."

The Discovery Eye Foundation: "Pupils Respond to More Than Light."

University of Illinois Extension: "Warning Signs and Symptoms of Common Illegal Drugs."

University of Maryland School of Medicine: "Anticholinergic or Sympathomimetic."

Reviewed by Whitney Seltman on August 6, 2019

SOURCES:

American Academy of Ophthalmology: "Pharmacologic Dilation of Pupil," "What Can Cause A Fixed Pupil?" "What to Expect When Your Eyes Are Dilated."

Benjamin, W., Borish, I. , Butterworth-Heinemann, 2006. Borish's Clinical Refraction

Headway: the Brain Injury Association: "Treatment and Recovery."

Lee, Andrew G., et al. Slack Inc., 2009. Curbside Consultation in Neuro-ophthalmology: 49 Clinical Questions,

Mayo Clinic: "Traumatic brain injury: Tests and diagnosis."

Moorfields Eye Hospital: "Anatomy of the eye."

The Discovery Eye Foundation: "Pupils Respond to More Than Light."

University of Illinois Extension: "Warning Signs and Symptoms of Common Illegal Drugs."

University of Maryland School of Medicine: "Anticholinergic or Sympathomimetic."

Reviewed by Whitney Seltman on August 6, 2019

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