Skip to content

Eye Health Center

Font Size

Eye Problems: Changes in Your Pupils - Topic Overview

With an injury to the eye, the muscles that control the pupil size and shape can be damaged. These muscles control the ability of the pupil to change in size and keep its round shape.

An injury that punctures the eyeball may tear the colored part (iris) of the eye, causing it to lose its round shape.

Recommended Related to Eye Health

Eye Twitching

Eye twitching is a repetitive, uncontrollable blinking or spasm of the eyelid, usually the upper lid. Eye twitching (blepharospasm) usually affects the eye muscles of both eyes. If you have eye twitching, you may have an involuntary movement that recurs every several seconds for a minute or two. Most people develop a minor eyelid twitch at some point in their lives. Although the cause is generally unknown, it may be associated with: Fatigue Stress Caffeine ...

Read the Eye Twitching article > >

An injury to the eye may also cause the pupils to react differently to light or to be different sizes.

Call your doctor for an evaluation if you have a change in the size or shape of your pupil after an injury to your eye.

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Medical Reference from Healthwise

    Last Updated: June 04, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
    Next Article:

    Eye Problems: Changes in Your Pupils Topics

    Today on WebMD

    Woman holding tissue to reddened eye
    Learn about causes, symptoms, and treatments.
    Simple annoyance or the sign of a problem?
    red eyes
    Symptoms, triggers, and treatments.
    blue eye with contact lens
    Tips for wearing and caring.
    Understanding Stye
    human eye
    eye exam timing
    vision test
    is vision correction surgery for you
    high tech contacts
    eye drop