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Visual stabilization of posture in the elderly: fallers vs. nonfallers
K Turano1, G S Rubin, S J Herdman
1Wilmer Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Summary
Older adults who fall have a reduced ability to use vision for balance. Improved contrast sensitivity is linked to better visual stabilization, crucial for preventing falls in seniors.
Area of Science:
- Gerontology
- Ophthalmology
- Biomechanics
Background:
- Postural instability is a major cause of falls in individuals aged 65 and older.
- Understanding the role of vision in postural stability is critical for fall prevention strategies.
Purpose of the Study:
- To investigate the relationship between vision, postural stability, and falls in older adults.
- To examine the association between postural stability, fear of falling, and visual function.
Main Methods:
- 185 community-dwelling adults aged 65+ completed fall history and fear of falling questionnaires.
- Postural sway was measured with eyes open and closed.
- Visual function was assessed using visual acuity and contrast sensitivity tests.
Main Results:
- Fallers exhibited less visual contribution to posture stabilization compared to non-fallers.
- A decrease in visual stabilization significantly increased the likelihood of reporting falls.
- Contrast sensitivity was associated with better visual stabilization, particularly with reliable somatosensory feedback.
Conclusions:
- The visual contribution to postural stabilization is significantly higher in non-fallers than in fallers.
- Contrast sensitivity is a key factor associated with visual stabilization and fall risk in older adults.