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Related Experiment Videos

Postural stability changes in the elderly with cataract simulation and refractive blur.

Vijay Anand1, John G Buckley, Andy Scally

  • 1Department of Optometry, University of Bradford, Bradford, United Kingdom.

Investigative Ophthalmology & Visual Science
|October 28, 2003
PubMed
Summary

Cataracts and refractive blur significantly worsen postural stability in the elderly, increasing fall risk. Correcting vision problems may help prevent falls.

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Area of Science:

  • Vision science
  • Gerontology
  • Biomechanics

Background:

  • Falls are a major health concern for the elderly, with visual impairment being a significant contributing factor.
  • Postural stability is crucial for preventing falls, and it can be affected by various sensory inputs, including vision.

Purpose of the Study:

  • To investigate how cataractous and refractive blur impact postural stability and limb-load asymmetry (LLA).
  • To determine the effect of spatial frequency and contrast of visual stimuli on postural stability.

Main Methods:

  • Thirteen elderly participants (mean age 70.76 years) with normal vision were assessed.
  • Postural stability (center of pressure) and LLA were measured under various conditions, including refractive blur (0-8 D), cataract simulation, and disrupted somatosensory input.

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  • Visual stimuli varied in spatial frequency (2 and 8 cyc/deg) and contrast (25% and 95%).

    • Main Results:

    • Cataract simulation and 8-D refractive blur significantly increased postural instability, especially with disrupted somatosensory input.
    • High spatial frequency visual targets exacerbated postural instability.
    • Refractive blur, cataract simulation, and eye closure did not affect LLA.

    Conclusions:

    • Cataractous and refractive blur contribute to increased postural instability in the elderly, elevating fall risk.
    • Changes in contrast sensitivity, not just resolution, are key to increased instability.
    • Interventions like correcting refractive errors and cataracts may reduce fall risk in older adults.