PUPILLARY DILATION Meaning and
Definition
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Pupillary dilation refers to the expansion or enlargement of the black circular opening in the center of the iris (colored part of the eye) called the pupil. It is a natural physiological response that is controlled by the autonomic nervous system and occurs in response to various stimuli.
When the pupil dilates, its diameter increases, allowing more light to enter the eye. This can happen in low-light conditions or when the individual is exposed to a dark environment, as the eye adjusts to let in more light and improve vision. Pupillary dilation can also occur in an involuntary manner in response to strong emotions such as fear, excitement, or surprise.
One common way to test and observe pupillary dilation is through the use of a penlight or other bright light source. By shining the light into the eye, the pupils will naturally constrict (get smaller) in response to the light. However, as the light is removed, the pupils dilate again.
Pupillary dilation can also be influenced by certain drugs or medications. For example, certain eye drops used during eye exams can cause temporary dilation. Additionally, some drugs, such as stimulants or hallucinogens, can induce pupillary dilation as a side effect.
In summary, pupillary dilation is the expansion of the pupil, allowing more light to enter the eye. It is a natural response controlled by the autonomic nervous system and can occur in different situations, including changes in lighting conditions and emotional arousal.
Common Misspellings for PUPILLARY DILATION
- oupillary dilation
- lupillary dilation
- 0upillary dilation
- pypillary dilation
- phpillary dilation
- pjpillary dilation
- pipillary dilation
- p8pillary dilation
- p7pillary dilation
- puoillary dilation
- pulillary dilation
- pu0illary dilation
- pupullary dilation
- pupjllary dilation
- pupkllary dilation
- pupollary dilation
- pup9llary dilation
- pup8llary dilation
- pupiklary dilation
- pupiplary dilation
Etymology of PUPILLARY DILATION
The term "pupillary dilation" is derived from a combination of two words: "pupillary" and "dilation".
1. Pupillary: This word comes from the noun "pupil" which refers to the dark circular opening in the center of the iris of the eye. The term "pupil" originates from the Latin word "pupilla", meaning "little girl". This is because the reflection of one's own image in another person's eye resembles a small person.
2. Dilation: This word is derived from the Latin verb "dilatare", which means "to enlarge" or "to spread out". It combines the prefix "dil-" (meaning "apart" or "widely") with the verb "latus" (meaning "carried" or "borne").
Thus, "pupillary dilation" refers to the widening or enlargement of the pupil.
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