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    Gait Alterations Negotiating A Raised Surface Induced by Monocular Blur

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    Publication date
    2008-12-01
    Author
    Vale, Anna
    Buckley, John G.
    Elliott, David B.
    Keyword
    Monocular blur
    Stereopsis
    Gait
    Elderly
    Falls
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    Falls in the elderly are a major cause of serious injury and mortality. Impaired and absent stereopsis may be a significant risk factor for falls or hip fracture, although data from epidemiological studies are not consistent. Previous laboratory based studies, however, do suggest that stereoacuity is an important factor in adaptive gait. The present study investigates how acute impairment of stereopsis, through monocular blur of differing levels, ranging from 0.50 diopter (D) to a monovision correction affected gait when negotiating a raised surface in elderly subjects. Eleven elderly subjects (73.3 3.6 years) walked up to and negotiated a raised surface under nine visual conditions, binocular vision, one eye occluded and 0.50 D, 1.00 D and monovision correction (mean 2.50 D 0.20 D) with blur and occlusion either over the dominant or non-dominant eye. Analysis focused on foot positioning and toe clearance parameters. There was no effect of ocular dominance on any parameters. Monocular blur impaired stereopsis (p 0.01), with more minor effects on high and low contrast acuity. Vertical and horizontal lead limb toe clearance both increased under all levels of monocular blur including the lowest level of 0.50 DBlur (p 0.03) and monovision correction led to toe clearance levels similar to that found with occlusion of one eye. Findings demonstrated that even small amounts of monocular blur can lead to a change in gait when negotiating a raised surface, suggesting acute monocular blur affected the ability to accurately judge the height of a step in the travel path. Further work is required to investigate if similar adaptations are used by patients with chronic monocular blur.
    URI
    http://hdl.handle.net/10454/15847
    Version
    No full-text in the repository
    Citation
    Vale A, Buckley JG and Elliott DB (2008) Gait Alterations Negotiating A Raised Surface Induced by Monocular Blur. 85(12): 1128-1134.
    Link to publisher’s version
    https://doi.org/10.1097/OPX.0b013e31818e8d2a
    Type
    Article
    Collections
    Life Sciences Publications
    Engineering and Informatics Publications

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