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Infrared Pupillometer

By Troy Bedinghaus, O.D., About.com

Updated: March 18, 2008

About.com Health's Disease and Condition content is reviewed by Kate Grossman, MD

Pupil measurement

Photo © Troy Bedinghaus
Definition: A device used by eye doctors to measure the size of the pupils. The device consists of a large camera tuned for infrared detection and two infrared side lamps for pupil illumination. A doctor can use an infrared pupillometer to measure the size of the pupils under different amounts of light, such as during daylight and during the night.

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