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Pupil tracking with a Hartmann-Shack wavefront sensor.

Justo Arines1, Paula Prado, Salvador Bará

  • 1Universidade de Santiago de Compostela, Escola Universitaria de Optica e Optometria, Departamento de Fisica Aplicada, 15782 Santiago de Compostela, Spain. justo.arines@usc.es

Journal of Biomedical Optics
|July 10, 2010
PubMed
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This study introduces a novel pupil tracking method using Hartmann-Shack aberrometry images. The technique accurately tracks eye movements, offering performance comparable to commercial eye trackers without extra devices.

Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Biomedical Optics

Background:

  • Accurate eye tracking is crucial for aberrometry and vision science.
  • Conventional eye trackers often require separate devices and synchronization.
  • Integrating pupil tracking within aberrometry simplifies the process.

Purpose of the Study:

  • To develop and validate a pupil tracking method using Hartmann-Shack (HS) aberrometric images.
  • To assess the accuracy and performance of this integrated method.
  • To demonstrate its potential for reprocessing existing HS data.

Main Methods:

  • Utilizing the irradiance centroid of HS images to determine pupil position.
  • Calibrating the system with an artificial eye and controlled displacements.

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  • Validating the method with human subjects using HS images.

    • Main Results:

    • Achieved root mean square (RMS) errors of 10.45 µm for an artificial eye.
    • Demonstrated RMS errors of 27, 10, and 6 µm for human eyes at varying signal-to-noise ratios.
    • Performance was comparable to commercial eye trackers.

    Conclusions:

    • The integrated HS pupil tracking method is accurate and reliable.
    • It eliminates the need for separate eye tracking hardware and synchronization issues.
    • The technique enables retrospective analysis and correction of ocular movements in HS aberrometry data.