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Related Experiment Video

Updated: Jul 23, 2025

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Using a video-based eye tracker to analyse the binocular near-reflex dynamics response.

Julián Espinosa1,2, Kauzar Archid1, Jorge Pérez1,2

  • 1Departamento de Óptica, Farmacología y Anatomía, Universidad de Alicante, Alicante, Spain.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|July 20, 2023
PubMed
Summary

A new video-based eye-tracking system measures binocular near-reflex dynamics, including convergence, divergence, and pupil size. This cost-effective tool aids in understanding visual responses during accommodation and disaccommodation.

Keywords:
accommodationconvergencenear-reflex responsepupillary accommodationvideo-based eye tracker

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • The binocular near-reflex response is crucial for clear vision at varying distances.
  • Understanding its dynamics aids in diagnosing visual disorders and assessing effects of near work.
  • Previous methods lacked simultaneous measurement of all three components.

Purpose of the Study:

  • To introduce a novel video-based eye-tracking system for analyzing near-reflex dynamics.
  • To enable simultaneous measurement of convergence, divergence, and pupillary size.
  • To provide a comprehensive understanding of the three-component near-reflex.

Main Methods:

  • Utilized a high-speed (90 Hz) video-based eye tracker with 15 participants.
  • Captured eye gaze and pupil radius changes during accommodation and disaccommodation.
  • Applied offline analysis with hyperbolic tangent function fitting to characterize response dynamics.

Main Results:

  • Observed significant temporal differences in pupil radius dynamics (miosis faster than mydriasis).
  • Found longer convergence times compared to vertical saccades.
  • Steady-state values for gaze and pupil size aligned with theoretical expectations.

Conclusions:

  • The system offers a non-invasive, portable, and cost-effective method for evaluating near-reflex dynamics.
  • High sampling rate ensures accurate assessment of vergence and pupillary dynamics.
  • Simultaneous measurement provides a comprehensive view, valuable for clinical diagnosis and research.