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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Buckley, John G. Scally, Andrew J. Elliott, David B. Foster, Richard J. Whitaker, David |
| Description | Country affiliation: United kingdom Author Affiliation: Foster RJ ( Bradford School of Optometry and Vision Science, University of Bradford, Bradford, United Kingdom.); Whitaker D ( Bradford School of Optometry and Vision Science, University of Bradford, Bradford, United Kingdom.); Scally AJ ( Faculty of Health Studies, University of Bradford, Bradford, United Kingdom.); Buckley JG ( Division of Medical Engineering, School of Engineering, University of Bradford, Bradford, United Kingdom.); Elliott DB ( Bradford School of Optometry and Vision Science, University of Bradford, Bradford, United Kingdom.) |
| Abstract | PURPOSE: Falls on stairs are a significant cause of morbidity and mortality in elderly people. A simple safety strategy to avoid tripping on stairs is increasing foot clearance. We determined whether a horizontal-vertical illusion superimposed onto stairs to create an illusory perceived increase in stair-riser height would increase stair ascent foot clearance in older participants. METHODS: Preliminary experiments determined the optimum parameters for the horizontal-vertical illusion. Fourteen older adults (mean age ± 1 SD, 68.5 ± 7.4 years) ascended a three-step staircase with the optimized version of the horizontal-vertical illusion (spatial frequency: 12 cycles per stair riser) positioned either on the bottom or top stair only, or on the bottom and top stair simultaneously. These were compared to a control condition, which had a plain stair riser with edge highlighters positioned flush with each stair-tread edge. Foot clearance and measures of postural stability were compared across conditions. RESULTS: The optimized illusion on the bottom and top stair led to a significant increase in foot clearance over the respective stair edge, compared to the control condition. There were no significant decreases in postural stability. CONCLUSIONS: An optimized horizontal-vertical visual illusion led to significant increases in foot clearance in older adults when ascending a staircase, but the effects did not destabilize their postural stability. Inclusion of the horizontal-vertical illusion on raised surfaces (e.g., curbs) or the bottom and top stairs of staircases could improve stair ascent safety in older adults. |
| ISSN | 01460404 |
| e-ISSN | 15525783 |
| Journal | Investigative Opthalmology & Visual Science |
| Issue Number | 5 |
| Volume Number | 56 |
| Language | English |
| Publisher | Association for Research in Vision and Ophthalmology |
| Publisher Date | 2015-05-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Accidental Falls Gait Physiology Illusions Postural Balance Toes Walking Biomechanical Phenomena Research Support, Non-u.s. Gov't Discipline Ophthalmology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ophthalmology Sensory Systems Cellular and Molecular Neuroscience |
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