pupil
//ˈpjuːpəl//
Translation
pupil
Definition
The pupil is the black circular opening in the center of the iris of the eye that allows light to enter the retina. It adjusts in size to control the amount of light reaching the eye, constricting in bright conditions and dilating in dim light. This automatic response, known as the pupillary light reflex, is crucial for vision and can also indicate neurological health. The pupil's size is regulated by muscles in the iris, influenced by factors like light intensity, emotional arousal, and certain medications. In medical contexts, examining the pupil's reaction to light helps assess brain function and detect conditions such as head injuries or drug effects.
Example
“The doctor shone a light into my eye to check how my pupil reacted.”
“In bright sunlight, your pupil becomes smaller to protect the retina.”
“When you enter a dark room, your pupil dilates to let in more light.”
“The size of the pupil can change due to emotions like fear or excitement.”
“An eye exam often includes measuring the pupil's response to light.”
“She noticed her pupil was unevenly sized and went to see an optometrist.”
“Certain drugs can cause the pupil to become extremely dilated.”
“The pupil constricts automatically when a bright flash goes off.”
“Looking at a close object makes the pupil slightly smaller.”
“The doctor used a penlight to test the pupillary reflex in both eyes.”
Synonyms
Other meanings
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