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  1. Dilated pupils - Overview

    Verified Expert
    Also known as: Also known as, mydriasis

    Unusual widening of the pupil of the eye.

    Common Causes

    Dilated pupils is not always related to an underlying condition. It may be caused by:

    • Fear
    • Medication side effects
    • Dim light
    • Injury to the eye
    • Recreational drugs
    See more

    Treatment

    Verified Expert
    See a doctor if you notice:
    • There is a previous history of dilated pupils
    • The symptom after starting a new medication
    See a doctor immediately if you notice:
    • Dilation of the pupils is due to an injury on the eyes or the head
    • The pupils are dilated for an unknown reason
    Self-treatment: Self- care steps that may be helpful in some less- serious cases:
    • Practice relaxation techniques
    • Work in good lighting
    • Talk to the doctor about replacing it if a new medicine is responsible
    • Do not use recreational drugs
    See more

    Specialist

    Verified Expert

    Primary care physician: Specializes in the acute and chronic illnesses and provides preventive care and health.

    Ophthalmologist: Specializes in the medical and surgical care of the eyes.

    Neurologist: Specializes in treating diseases of the nervous system, which includes the brain, the spinal cord, and the nerves.

    See more
    Free Printable Pupil Size Charts [PDF] & Actual Size, MM, Scale
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    Microsoft Start Health
    Free Printable Pupil Size Charts [PDF] …
    Type Calendar
    Source: Focus Medica. For informational purposes only. Consult a medical professional for advice.
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    Table of Contents
    Overview
    Treatment
    Specialist
    What is a normal pupil size?
    Ask an expert
     

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  2. Healthline
    https://www.healthline.com/health/normal-pupil-size

    What's Normal Pupil Size and When Do Pupils Change? - Healthline

     
  3. All About Vision
    https://www.allaboutvision.com/conditions/dilated-pupils.htm

    Dilated Pupils & Pupil Dilation: Causes & Symptoms - All About …

  5. Type Calendar
    https://www.typecalendar.com/free-printable-pupil...

    Free Printable Pupil Size Charts [PDF] & Actual Size, MM, Scale

  6. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/books/NBK381

    The Pupils - Clinical Methods - NCBI Bookshelf

    WEBThe normal pupil size in adults varies from 2 to 4 mm in diameter in bright light to 4 to 8 mm in the dark. The pupils are generally equal in size. They constrict to direct illumination (direct response) and to illumination of the …

  7. Stanford Medicine 25
    https://stanfordmedicine25.stanford.edu/th…

    Pupillary Responses - Stanford Medicine 25

    WEBDilation is controlled by the dilator pupillae, a group of muscles in the peripheral 2/3 of the iris. Sympathetic innervation begins at the cortex with the first synapse at the cilliospinal center (also known as Budge's center …

  8. Perrla Eyes
    https://perrlaeyes.com/the-pupillary-pupil-…

    The Pupillary: Pupil Size Normal and Assessment

    WEBA dilated pupil should be around the size of 5.0 mm while a constricted pupil should be around the size of 2.0 mm. You should know that younger people tend to have bigger pupil compared to adult or elderly. When you do an …

  9. People also ask
    How big should a dilated pupil be?
    A dilated pupil should be around the size of 5.0 mm while a constricted pupil should be around the size of 2.0 mm. You should know that younger people tend to have bigger pupil compared to adult or elderly. When you do an eye assessment, any differences or abnormalities on the pupil are noted. Long nerve pathway controlled how the pupil reacts.

    The Pupillary: Pupil Size Normal and Assessment | Perrla Eyes

    perrlaeyes.com
    What does a dilated pupil look like?
    Pupils tend to become bigger (dilate) in low-light situations. This allows more light into the eyes, making it easier to see. When there’s a lot of bright light, your pupils will become smaller (constrict). A fully dilated pupil is typically in the 4 to 8 millimeters in size, while a constricted pupil is in the 2 to 4 mm range.

    What's Normal Pupil Size and When Do Pupils Change? - Healthline

    healthline.com
    What is a normal pupil size?
    In bright light, your pupils constrict (get smaller) to prevent too much light from entering your eyes. In dim lighting, your pupils dilate (get larger) to allow more light in. Normal pupil size generally ranges from 2.0 to 4.0 millimeters (mm) in bright light, and 4.0 to 8.0 mm in the dark. To some degree, pupil size tends to get smaller with age.

    Dilated Pupils & Pupil Dilation: Causes & Symptoms - All About Vision

    allaboutvision.com
    What does dilated pupil mean?
    Dilated pupils happen when the black circles in the colored part of your eye (iris) gets larger. Muscles in the iris control the size of your pupils. The normal pupil size for an adult varies but can be from 2 mm to 8 mm, depending on whether the eyes are being exposed to light or are in the dark. What Is Anisocoria?

    Dilated Pupils: Symptoms, Causes, and Treatment - Verywell Health

    verywellhealth.com
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  10. EyeGuru
    https://eyeguru.org/blog/examining-the-pupil

    How to examine the pupil - EyeGuru

    WEBPupil dilation is performed to purposefully increase the size of the pupils during an eye exam so that the eye doctor can fully examine the health of the optic nerve and retina. The exam is critical to preventing and treating …

  11. Review of Optometry
    https://www.reviewofoptometry.com/article…

    Pupil Testing: Implications for Diagnosis - Review of …

    WEBMar 15, 2016 · Under normal illumination, the average adult’s pupil size measures around 3.5mm, but can vary from 1.0mm to 10mm and get smaller as one ages due to senile miosis. 7 A difference of 0.4mm or …

  12. School of Medicine
    https://neuro-ophthalmology.stanford.edu/…

    Neuro-ophthalmology Illustrated Chapter 12 – The …

    WEBOct 10, 2019 · When examining the pupils, what 6 items should be recorded? –1. Size (in millimeters) –2. Presence of anisocoria. –3. Response to light (direct and consensual response) –4. Presence of a …

  13. AMBOSS
    https://www.amboss.com/us/knowledge/physiology-and...

    Physiology and abnormalities of the pupil - Knowledge - AMBOSS

  14. Verywell Health
    https://www.verywellhealth.com/what-can …

    Abnormal Pupil Size: Causes and Symptoms

    WEBNov 11, 2010 · In dark or dim light, the pupil dilates to allow more light into the eye so you can see better. Dilated pupils—called mydriasis —range from 4 to 8 millimeters in size. Your pupils also constrict slightly to look …

  15. Healthline
    https://www.healthline.com/health/perrla-eyes

    PERRLA: What It Means for Pupil Testing - Healthline

  16. Medical News Today
    https://www.medicalnewstoday.com/articles/pupils-different-sizes

    Pupils different sizes: Causes and when to see a doctor

  17. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/books/NBK603732

    The Effect of Pupil Size on Visual Resolution

    WEBFeb 28, 2024 · In bright light, normal pupil diameter in adults can range from 2 mm to 4 mm; in dark light, it ranges from 4 mm to 8 mm. [3] Variations in pupil size are due to factors such as age, pharmaceuticals, …

  18. WebMD
    https://www.webmd.com/eye-health/why-are-pupils-dilated-mydriasis

    Why Are My Pupils Dilated? 5 Causes of Dilated Pupils …

  19. Cleveland Clinic
    https://my.clevelandclinic.org/health/body/24317-pupil-of-the-eye

    Pupil of the Eye: Definition, Anatomy & Function - Cleveland Clinic

  20. NVISION Eye Centers
    https://www.nvisioncenters.com/conditions/eye-dilation

    Eye Dilation Guide: Key Facts, Side Effects & How It Works

  21. Cleveland Clinic
    https://my.clevelandclinic.org/health/symptoms/22238

    Dilated Pupils (Mydriasis): What Is It, Causes & What It Looks Like

  22. Verywell Health
    https://www.verywellhealth.com/dilated-pupils-5095929

    Dilated Pupils: Symptoms, Causes, and Treatment - Verywell Health

  23. Vision Center
    https://www.visioncenter.org/conditions/dilated-pupils

    Dilated Pupils: Causes, Risks & Treatments - Vision Center

  24. Mayo Clinic
    https://www.mayoclinic.org/healthy-lifestyle/adult...

    Eye dilation: Necessary with every eye exam? - Mayo Clinic

  25. RCEMLearning India
    https://www.rcemlearning.org/.../topic/pupil-size

    Pupil size – RCEMLearning India

  26. Vision Center
    https://www.visioncenter.org/conditions/mydriasis

    Mydriasis: Why Are My Pupils Dilated and What Should I Do?