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Pupillary Sphincter
Definition: The pupillary sphincter is a circular muscle located in the iris of the eye that controls the size of the pupil, regulating the amount of light that enters the eye.
Usage:
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Noun (Anatomy): The pupillary sphincter contracts or relaxes in response to different lighting conditions, adjusting the size of the pupil accordingly.
Example Sentence: The pupillary sphincter contracted, decreasing the size of my pupils, as I stepped out into the bright sunlight.
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Noun (Medical): Dysfunction of the pupillary sphincter can lead to conditions such as anisocoria, where the pupils are unequal in size.
Example Sentence: The doctor diagnosed the patient with a malfunctioning pupillary sphincter, causing one pupil to be significantly larger than the other.
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Noun (Zoology): Various animal species possess a pupillary sphincter that enables them to adapt their vision to different light intensities.
Example Sentence: The nocturnal owl's pupillary sphincter allows it to dilate its pupils for improved night vision.
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