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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.
Pink eye is an inflammation of the conjunctiva (the covering of the eyeball and inside of the eyelid). This inflammation may lead to redness, tearing, discharge, itching, and pain. Pinkeye is also called conjunctivitis.
Read the Pink Eye 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.
WebMD Medical Reference from Healthwise
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