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Glaucoma-Related Differences in Gaze Behavior When Negotiating Obstacles.

Kim Lajoie1, Andreas B Miller1, Robert A Strath1

  • 1Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.

Translational Vision Science & Technology
|July 28, 2018
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Summary

People with glaucoma have altered gaze patterns and collide more with obstacles, especially when multitasking. This impacts safe navigation and mobility.

Keywords:
gazeglaucomalocomotionmobilityobstacle avoidance

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomechanics

Background:

  • Safe navigation relies on effective visual sampling of the environment.
  • Visual field loss, common in glaucoma, can impair environmental perception and increase fall risk.
  • Gaze strategies are crucial for obstacle avoidance during locomotion.

Purpose of the Study:

  • To investigate differences in gaze strategies and obstacle collisions between individuals with glaucoma and controls during navigation.
  • To determine the impact of multitasking on gaze behavior and collision rates in glaucoma patients.

Main Methods:

  • Twenty individuals with moderate-severe glaucoma and 20 controls navigated an obstacle course.
  • Gaze patterns and obstacle contacts were recorded under three conditions: obstacle-only, simulated conversation, and visual search.
  • Multitasking conditions simulated real-world navigation challenges.

Main Results:

  • Glaucoma patients exhibited altered gaze, focusing closer to their position and fixating more on obstacles.
  • Despite altered gaze, glaucoma patients had significantly more obstacle collisions.
  • Multitasking amplified gaze changes and increased obstacle contacts in the glaucoma group.

Conclusions:

  • Glaucoma significantly alters gaze patterns during obstacle negotiation, leading to increased collisions.
  • Multitasking exacerbates these visuomotor deficits, posing greater risks for individuals with glaucoma.
  • Findings inform the development of gaze training interventions to improve mobility and safety for glaucoma patients.