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   What is the size of a pupil?

   • The size of the pupil varies from person to person. Some people have large pupils, and some people have small pupils. Also, pupil size changes with age — children and young adults tend to have large pupils, and seniors usually have small pupils.

   Pupil - Definition and Detailed Illustration - All About Vision

   www.allaboutvision.com/resources/pupil.htm

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   What does a pupil look like?

   • The pupil is the black opening in the middle of the colored part of your eye (iris). The pupil gets bigger or smaller in response to changes in light. Muscles in the iris control the size of the pupil. Pupil issues can suggest certain diseases.

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

   my.clevelandclinic.org/health/body/24317-pupil-of-the-eye

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   What is the function of a pupil?

   • Pupils are the black center of the eye. Their function is to let in light and focus it on the retina (the nerve cells at the back of the eye) so you can see. Muscles located in your iris (the colored part of your eye) control each pupil. While your two pupils will usually be roughly the same size, pupil size overall can fluctuate.

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

   www.healthline.com/health/normal-pupil-size

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   What is a pupil in a human eye?

   • The pupil is the black hole in the center of the colored part of your eye (iris). The pupil is the pathway that lets light get to your retina.

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

   my.clevelandclinic.org/health/body/24317-pupil-of-the-eye

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2. my.clevelandclinic.org › health › bodyPupil of the Eye: Definition, Anatomy & Function

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   Oct 4, 2022 · The pupil is the black opening in the middle of the colored part of your eye (iris). The pupil gets bigger or smaller in response to changes in light. Muscles in the iris control the size of the pupil. Pupil issues can suggest certain diseases. Contents Overview Function Anatomy Conditions and Disorders Care.

3. www.healthline.com › health › normal-pupil-sizeWhat's Normal Pupil Size and When Do Pupils Change? - Healthline

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   There's an average pupil size that's considered normal. Measured in millimeters, your eyes' pupils can change based on light, medications, and even emotions.

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5. www.verywellhealth.com › what-can-my-pupil-eyeAbnormal Pupil Size: Causes and Symptoms - Verywell Health

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   Nov 11, 2010 · Pupil Size and LASIK. Normal pupil size ranges between 1/16 to 5/16 of an inch (2.0 to 8.0 millimeters), depending on the lighting. The size of your pupil can tell your healthcare provider quite a bit about your health. It's an important key to unlocking possible medical conditions you might not otherwise know about.

6. www.ncbi.nlm.nih.gov › books › NBK381The Pupils - Clinical Methods - NCBI Bookshelf

   www.ncbi.nlm.nih.gov › books › NBK381

   The 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 opposite eye (consensual response). The pupil dilates in the dark.

   • Author: Robert H. Spector

   • Published: 1990

7. www.medicalnewstoday.com › pupils-different-sizesPupils different sizes: Causes and when to see a doctor

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   Apr 11, 2023 · Pupils, or the black parts at the center of the eyes, change size to regulate the amount of light entering the eye. Pupils are large in the dark to let more light in...

   • Author: Adrienne Stinson

8. www.allaboutvision.com › resources › pupilPupil - Definition and Detailed Illustration - All About Vision

   www.allaboutvision.com › resources › pupil

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   Feb 27, 2019 · Pupil Size. The size of the pupil varies from person to person. Some people have large pupils, and some people have small pupils. Also, pupil size changes with age — children and young adults tend to have large pupils, and seniors usually have small pupils.

9. www.ncbi.nlm.nih.gov › books › NBK603732The Effect of Pupil Size on Visual Resolution - StatPearls ...

   www.ncbi.nlm.nih.gov › books › NBK603732

   Feb 28, 2024 · The human pupil regulates the amount of light that reaches the retina and profoundly impacts vision. Pupil size, denoted by the diameter of the black circular opening at the center of the iris, is modulated by a dynamic balance between the iridic constrictor and dilator muscles.