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Gaze behavior during navigation with reduced acuity.

Andrew Freedman1, Jacob Achtemeier2, Yihwa Baek1

  • 1University of Minnesota, Minneapolis, MN 55455, United States; Minnesota Lab for Low Vision Research, 75 E River Rd, Minneapolis, MN 55455, United States.

Experimental Eye Research
|November 17, 2018
PubMed
Summary
This summary is machine-generated.

Restricting visual acuity impairs navigation and object search in normally sighted individuals, mimicking some challenges faced by those with low vision. Artificially blurred vision increased travel time and missed objects, highlighting navigation difficulties.

Keywords:
Acuity impairmentGaze behaviorLow visionMobilityNavigationVisual accessibilityVisual search

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Area of Science:

  • Vision Science
  • Human-Computer Interaction
  • Rehabilitation Engineering

Background:

  • Visual search and navigation in unfamiliar indoor environments are challenging for individuals with visual impairments.
  • Understanding how visual acuity affects these tasks is crucial for developing assistive technologies.

Purpose of the Study:

  • To investigate the impact of restricted visual acuity on visual search and navigation in normally sighted individuals.
  • To compare the performance of acuity-restricted normally sighted subjects with subjects having naturally occurring low vision.

Main Methods:

  • Two experiments were conducted using normally sighted subjects and subjects with low vision.
  • Visual acuity was artificially restricted using blur foils in normally sighted subjects.
  • Head-mounted eye trackers monitored gaze behavior during navigation and object search tasks.
  • Travel time and letter recognition accuracy were measured.

Main Results:

  • Restricted visual acuity significantly increased travel time when combined with an object search task (by ~63%).
  • Blurred vision caused normally sighted subjects to look down more, increasing object examination time but also missed objects.
  • Low-vision subjects exhibited similar gaze patterns to acuity-restricted subjects, often looking at the floor-wall boundary, and missed more objects.

Conclusions:

  • Artificially restricted visual acuity alters navigation strategies, leading to increased time spent examining objects but reduced detection rates.
  • Low-vision subjects utilize the floor-wall boundary as a potential navigation cue.
  • Findings provide insights into the navigation and search difficulties experienced by visually impaired individuals.