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dc.contributor.authorVale, Anna*
dc.contributor.authorBuckley, John*
dc.contributor.authorElliott, David*
dc.date.accessioned2018-05-10T13:03:58Z
dc.date.available2018-05-10T13:03:58Z
dc.date.issued01/12/2008
dc.identifier.citationVale A, Buckley JG and Elliott DB (2008) Gait Alterations Negotiating A Raised Surface Induced by Monocular Blur. 85(12): 1128-1134.
dc.identifier.urihttp://hdl.handle.net/10454/15847
dc.descriptionNo
dc.description.abstractFalls 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.
dc.language.isoen
dc.subjectMonocular blur
dc.subjectStereopsis
dc.subjectGait
dc.subjectElderly
dc.subjectFalls
dc.titleGait Alterations Negotiating A Raised Surface Induced by Monocular Blur
dc.status.refereedYes
dc.typeArticle
dc.type.versionNo full-text in the repository
dc.identifier.doihttps://doi.org/10.1097/OPX.0b013e31818e8d2a
dc.openaccess.statusclosedAccess


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