title: The human pupil and the use of video-based eyetrackers.
abstract: Video-based devices for measuring gaze direction are widespread. However, there is a built-in imprecision in such devices in the event that pupil diameter changes during the experiments. Data are presented to demonstrate this effect. The possibility of correcting eye-position records for the imprecision is discussed and preliminary examples of such correction are presented.
authors.affiliation: Biological Sciences, SUNY Optometry, New York, NY, United States. harryjwyatt@gmail.com
authors.forename: Harry J
authors.initials: HJ
authors.lastname: Wyatt
mesh_terms: D003936:Diagnosis, Computer-Assisted; D053483:Eye Movement Measurements; D005133:Eye Movements; D006801:Humans; D009885:Ophthalmology / Q000379:methods*; D011680:Pupil / Q000502:physiology*