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How can you tell if benign episodic unilateral mydriasis is causing your pupils to appear large?

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This condition means only one pupil is dilated. It's called "benign" because it's not related to any serious conditions, but it can sometimes affect young women who get migraines. The pupil usually goes back to normal size within a few hours, but it can last for several days.

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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When should you see your doctor about large pupils?

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