A mechanical device use to record changes in the diameter of a subject's pupil is called eye-tracking monitor.

Name: A mechanical device use to record changes in the diameter of a subject's pupil is called eye-tracking monitor.
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A device used to record changes in the diameter of a subject's pupil is called a pupillometer, not an eye-tracking monitor. Eye-tracking monitors are used to determine where a person is looking by tracking the movement of the eyes.

A Mechanical Device Use to Record Changes in the Diameter