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Quantitative Approach for the Analysis of Fusional Convergence Using Eye-Tracking and SacLab Toolbox.

Laura Cercenelli1, Michela Fresina2, Barbara Bortolani3

  • 1Laboratory of Bioengineering, Department of Experimental Diagnostic and Specialty Medicine (DIMES), Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, Bologna, Italy.

Journal of Healthcare Engineering
|August 25, 2018
PubMed
Summary
This summary is machine-generated.

Eye tracking technology and SacLab software offer an objective method to analyze fusional vergence responses. This approach quantifies eye movements, aiding in the clinical evaluation of binocular vision and potential vergence disorders.

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Area of Science:

  • Ophthalmology and Vision Science
  • Biomedical Engineering
  • Neuroscience

Background:

  • Fusional vergence is crucial for maintaining single binocular vision.
  • Objective quantitative analysis of fusional vergence is clinically valuable.
  • Existing methods may lack precision or objectivity.

Purpose of the Study:

  • To introduce and evaluate an objective approach for analyzing fusional convergence response.
  • To utilize eye tracking (ET) technology and the SacLab toolbox for quantitative data analysis.
  • To assess the efficacy of this method in subjects with normal binocular vision.

Main Methods:

  • Employed Viewpoint ET for recording eye movements in 26 subjects.
  • Utilized the SacLab toolbox for automatic analysis of fusional vergence.
  • Tested subjects with base-out prisms (4Δ, 6Δ, 10Δ) to elicit responses.
  • Calculated parameters: convergence duration (CD), peak convergence velocity (PCV), number of intrusive saccades (NS), and mean saccadic amplitude (MSA).

Main Results:

  • Fewer subjects achieved fusion with higher prism magnitudes.
  • Significant increases in CD and PCV observed with increasing prism strength (p < 0.05).
  • NS and MSA showed no significant change at 6Δ but increased significantly at 10Δ (p < 0.05).

Conclusions:

  • Noninvasive ET combined with SacLab provides a valid method for objective fusional vergence characterization.
  • This approach offers objective evaluation for clinicians.
  • Potential application in diagnosing and managing patients with vergence disorders.