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Markerless monocular tracking system for guided external eye surgery.

C Monserrat1, M J Rupérez1, M Alcañiz1

  • 1LabHuman, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.

Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society
|September 11, 2014
PubMed
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This study introduces a novel eye tracking system for ophthalmic surgery, utilizing scleral textures for precise guidance. The system achieves sub-0.5% error in tracking, even with occlusions, enhancing surgical accuracy.

Area of Science:

  • Ophthalmology
  • Computer Vision
  • Medical Imaging

Background:

  • Accurate eye tracking is crucial for guiding ophthalmologists during external eye surgery.
  • Traditional tracking methods often fail due to occlusion of the pupil and cornea.
  • A novel approach is needed to overcome these limitations in real-time surgical scenarios.

Purpose of the Study:

  • To develop and evaluate a markerless monocular tracking system for external eye surgery.
  • To enable accurate eye tracking using only scleral textures, independent of pupil or corneal visibility.
  • To assess the system's performance using established invariant point detection algorithms.

Main Methods:

  • Implemented a markerless monocular tracking system using Scalable Invariant Feature Transforms (SIFT) and Speed Up Robust Features (SURF).
Keywords:
Computer aided surgeryExternal eye surgeryEye trackingMarkerless video trackingSIFTSURF

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  • Focused on detecting invariant points and correspondences solely from scleral textures.
  • Tested the system on phantom eyes with 360° rotation and real eye images.

    • Main Results:

    • The system demonstrated high accuracy, with tracking errors below 0.5% for spherical objects at 360° rotation.
    • Both SIFT and SURF algorithms yielded comparable, excellent tracking performance.
    • Promising results were observed on real eye images, even with occlusions from blood or surgical instruments.

    Conclusions:

    • The developed markerless tracking system offers a robust solution for ophthalmic surgery guidance.
    • Utilizing scleral textures overcomes limitations of traditional methods, improving tracking reliability.
    • The system shows significant potential for enhancing precision and safety in external eye surgeries.