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OpenIrisDPI: An Open-Source Digital Dual Purkinje Image Eye Tracker for Visual Neuroscience.

Ryan Akiyama Ressmeyer1, Jorge Otero-Millan2, Gregory D Horwitz3,1

  • 1Bioengineering, University of Washington, 3720 15th Ave NE, Seattle, 98195, WA, USA.

Biorxiv : the Preprint Server for Biology
|December 15, 2025
PubMed
Summary
This summary is machine-generated.

OpenIrisDPI offers high-precision dual Purkinje image (DPI) eye tracking, surpassing traditional pupil center and corneal reflection (P-CR) methods. This accessible, open-source tool enhances accuracy in visual neuroscience research.

Keywords:
Digital eye trackingDual Purkinje imageLateral geniculate nucleusMacaca mulattaPupil decentrationPupilographyReceptive fields

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Area of Science:

  • Neuroscience
  • Vision Science
  • Psychology

Background:

  • Video-based eye trackers are crucial in vision science, psychology, and neurophysiology.
  • Traditional pupil center and corneal reflection (P-CR) methods often lack the precision required for demanding applications.
  • Existing P-CR systems can be costly and may not meet stringent eye tracking quality requirements.

Purpose of the Study:

  • Introduce OpenIrisDPI, an open-source plugin for the OpenIris framework.
  • Implement dual Purkinje image (DPI) tracking for enhanced eye tracking accuracy.
  • Enable simultaneous pupillography and direct comparison between P-CR and DPI signals.

Main Methods:

  • Developed OpenIrisDPI, an open-source plugin for the OpenIris framework.
  • Utilized dual Purkinje image (DPI) tracking.
  • Collected data from macaque monkeys for validation.

Main Results:

  • OpenIrisDPI demonstrated superior precision compared to P-CR methods in tracking fixational drift.
  • DPI signal accuracy was validated using high-density extracellular recordings in the lateral geniculate nucleus.
  • Using DPI signals for compensation resulted in sharper estimates of neuronal receptive fields than P-CR signals.

Conclusions:

  • OpenIrisDPI provides high-precision eye tracking, including pupillography and DPI, on accessible hardware.
  • It is more affordable and accessible than many existing DPI and P-CR systems.
  • OpenIrisDPI significantly benefits visual neuroscience by offering accurate retinal image knowledge during experiments.