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Development and validation of a high-speed stereoscopic eyetracker.

Annemiek D Barsingerhorn1,2, F Nienke Boonstra3,4,5, Jeroen Goossens3

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This new stereo eyetracker simplifies calibration, making eye tracking accessible for individuals unable to complete traditional procedures. It offers high accuracy and resolution for reliable eye movement data collection.

Keywords:
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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Traditional video-based eyetrackers necessitate extensive participant calibration.
  • Certain populations, including infants and those with visual impairments, struggle with standard calibration procedures.
  • Stereo vision techniques can directly estimate eye optical axis orientation, reducing calibration needs.

Purpose of the Study:

  • To develop and validate a stereo eyetracker requiring minimal calibration.
  • To assess the performance of the new system for tracking eye movements in diverse participants.
  • To provide a more accessible eye-tracking solution for challenging populations.

Main Methods:

  • Development of a stereo eyetracker using two USB 3.0 cameras and infrared illumination.
  • Implementation of a user interface for real-time monitoring and adjustment.
  • Validation against an established system (EyeLink 1000 Plus) using nine healthy participants.

Main Results:

  • The stereo eyetracker achieves high-speed (350 Hz) tracking for both eyes up to 20° eccentricity.
  • Demonstrated 2D accuracy better than 1°, supporting ±5 cm head motion tolerance.
  • Achieved resolution better than 0.2° (SD) and low sample-to-sample noise (<0.05° RMS).

Conclusions:

  • The developed stereo eyetracker is a valid and portable instrument for eye movement recording.
  • Its simplified calibration makes it particularly suitable for populations unable to perform traditional calibration.
  • This system enhances accessibility for eye-tracking research and clinical applications.