Pupillary distance
Pupillary Distance
Pupillary distance (PD) or interpupillary distance (IPD) is the distance measured in millimeters between the centers of the pupils of the eyes. This measurement is used when preparing to make prescription eyeglasses.
Pronunciation
Pupillary distance: /ˈpjuːpɪləri/ /ˈdɪstəns/
Etymology
The term "pupillary distance" is derived from the Latin word "pupilla," which means "little doll," and the English word "distance," which originates from the Old French "distance," meaning "a space or interval."
Measurement
Pupillary distance is typically measured using a pupilometer, a specialized tool used by optometrists and ophthalmologists. However, it can also be measured manually using a ruler. The average adult's pupillary distance is between 54-74 mm, while for children, it is between 43-58 mm.
Related Terms
- Pupil: The circular black area in the center of the eye that allows light to enter.
- Optometrist: A healthcare professional who provides primary vision care.
- Ophthalmologist: A medical doctor who specializes in eye and vision care.
- Pupilometer: A tool used to measure pupillary distance.
See Also
External links
- Medical encyclopedia article on Pupillary distance
- Wikipedia's article - Pupillary distance
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