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Custom Monocular Calibration for Enhanced Eye-Tracking Accuracy.

Federico Ferracini, Francesca Peveri, Eleonora A Borsani Villa

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 3, 2025
    PubMed
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    This study introduces a custom monocular eye-tracking calibration method for individuals with binocular vision disorders. The new approach improves accuracy by correcting for eye misalignment, offering a viable alternative to standard binocular calibration.

    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Human-Computer Interaction

    Background:

    • Standard eye-tracker calibration assumes functional binocular vision.
    • Binocular vision disorders (e.g., strabismus, amblyopia) compromise calibration accuracy.
    • Deviated eyes in these conditions lead to biased gaze measurements.

    Purpose of the Study:

    • To develop and validate a custom monocular calibration method for improved eye-tracking accuracy.
    • To address limitations of standard binocular calibration for individuals with binocular vision disorders.
    • To enable reliable oculomotor function assessment in clinical settings.

    Main Methods:

    • A custom monocular calibration method was developed.
    • Data collected using a Head Mounted Display (HMD) with an embedded binocular eye-tracker.

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  • Participants included healthy individuals and those with binocular vision disorders.

    • Main Results:

    • The monocular method showed a slight but significant accuracy improvement in healthy participants.
    • The approach effectively corrected calibration errors in participants with binocular vision disorders.
    • Restored accuracy in gaze direction measurement for individuals with deviated eyes.

    Conclusions:

    • The custom monocular calibration is suitable for general use and beneficial for individuals with binocular vision disorders.
    • This method provides a viable alternative for those unable to complete standard binocular calibration.
    • Enables reliable oculomotor assessment and potential development of clinical diagnostic aids.