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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Visual function, visual attention, and mobility performance in low vision.

Susan J Leat1, Jan E Lovie-Kitchin

  • 1School of Optometry, University of Waterloo, Waterloo, Ontario, Canada. leat@uwaterloo.ca

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Summary

Useful field of view (UFV) measures predict mobility errors and walking speed in visually impaired individuals. Attention, visual function, and age are key factors in orientation and mobility performance.

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Area of Science:

  • Ophthalmology
  • Rehabilitation Science
  • Human Factors

Background:

  • Low vision significantly impacts orientation and mobility (O&M).
  • The useful field of view (UFV) assesses visual attention, clutter processing, and basic visual functions.
  • Predicting O&M performance is crucial for effective rehabilitation.

Purpose of the Study:

  • To evaluate the predictive utility of UFV measures for O&M in individuals with visual impairment.
  • To determine if UFV, corrected for visual field loss, offers improved prediction.
  • To identify key factors influencing mobility performance in this population.

Main Methods:

  • Thirty-five participants (20-80 years) with low vision completed an indoor/outdoor mobility course.
  • Measurements included UFV, contrast sensitivity (CS), visual fields, and visual acuity.
  • Two models were tested: uncorrected UFV and UFV corrected for visual field loss.

Main Results:

  • Uncorrected UFV significantly predicted mobility errors (R=0.38) and walking speed (R=0.575).
  • Age was also a strong predictor of walking speed (R=0.573).
  • Clinical vision measures predicted visual detection/identification distances; corrected UFV did not improve models.

Conclusions:

  • Attention, distractors, visual function, and age are vital for O&M.
  • UFV, particularly uncorrected, is a valuable predictor of mobility errors and speed.
  • These findings inform strategies for improving O&M in visually impaired individuals.