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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Related Experiment Video

Updated: Jan 13, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Links between central visual field loss and movement processing during walking.

Natela M Shanidze1, Catherine P Agathos1, Toby J Ellmers2

  • 1The Smith-Kettlewell Eye Research Institute, San Francisco, CA, USA.

Gait & Posture
|January 9, 2026
PubMed
Summary
This summary is machine-generated.

Central visual field loss (CFL) impairs balance and gait by diverting attention. Severe CFL may require altered cognitive strategies for movement control, impacting stability.

Keywords:
AgingContrast sensitivityGait-specific attentionMacular degenerationTimed up and goVisual deficit

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Gerontology

Background:

  • Central visual field loss (CFL) is a primary cause of irreversible vision impairment in older adults.
  • CFL is linked to increased fall risk and concerns about falling.
  • Understanding CFL's impact on balance and gait is crucial for fall prevention.

Purpose of the Study:

  • To investigate the relationship between CFL severity, functional balance, and attentional processing during walking.
  • To explore how visual impairment affects gait performance and stability.
  • To identify potential strategies for improving balance and gait in individuals with CFL.

Main Methods:

  • Two studies were conducted involving individuals with CFL and age-matched controls.
  • Functional balance was assessed using the Timed Up and Go (TUG) test.
  • Gait-specific attentional processing (G-SAP), contrast sensitivity, and head/trunk acceleration during TUG were measured.

Main Results:

  • Individuals with CFL showed correlations between TUG duration and G-SAP scores.
  • Worse contrast sensitivity in CFL was associated with reduced cognitive processing during walking and increased gait instability (head/trunk acceleration).
  • Higher rumination and conscious movement processing correlated with better segmental control in CFL.

Conclusions:

  • Increased cognitive processing of gait is linked to impaired balance, but this association is altered in CFL.
  • Severe visual deficits in CFL may redirect cognitive resources towards visuospatial processing, potentially compromising movement control.
  • Targeted gait and balance training focusing on heightened gait-specific attention may benefit individuals with CFL.