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Related Experiment Videos

A simplified calibration method for three-dimensional eye movement recordings using search-coils

K Bartl1, C Siebold, S Glasauer

  • 1Department of Neurology, Ludwig Maximilians University, Munich, Germany.

Vision Research
|April 1, 1996
PubMed
Summary

This study introduces a new algorithm for calibrating three-dimensional eye movements using two magnetic fields and search-coils. The method simplifies calibration by not requiring coil orientation knowledge and uses fixation points for accuracy.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Accurate measurement of three-dimensional (3D) eye movements is crucial for understanding visual perception and neurological disorders.
  • Existing eye-tracking methods often require complex calibration procedures and precise knowledge of sensor orientation.

Purpose of the Study:

  • To develop and validate a novel algorithm for calibrating 3D eye movements using two magnetic fields and two search-coils.
  • To simplify the calibration process by eliminating the need for known relative coil orientation.

Main Methods:

  • An algorithm was developed to calibrate 3D eye movements using two magnetic fields and two search-coils.
  • A calibration cube was used to measure crosstalk and offset voltages prior to recordings.

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  • Calibration involved fixation on a point and spontaneous eye movements, with optional additional fixation points.

    • Main Results:

    • The algorithm successfully calibrates 3D eye movements without requiring prior knowledge of the search-coils' relative orientation.
    • The use of a calibration cube effectively measures crosstalk and initial offset voltages.
    • Position quaternions were applied for computing eye movement recordings and determining Listing's plane in humans and monkeys.

    Conclusions:

    • The presented algorithm offers a simplified and effective method for calibrating 3D eye movements.
    • This technique enhances the accuracy and accessibility of eye-tracking research in various fields.
    • The method is applicable to eye movement recordings in both human and non-human primates.