What drives adaptive gait changes to acutely presented monocular blur?

Chapman, GJ, Scally, AJ and Elliott, DB 2011, 'What drives adaptive gait changes to acutely presented monocular blur?' , Optometry and Vision Science, 88 (2) , pp. 352-354.

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PURPOSE: To determine whether gait alterations due to monocular spherical lens blur were a safety strategy or driven by lens magnification. METHODS: Adaptive gait and visual function were measured in 10 older adults (mean age, 74.9 ± 4.8 years) with the participants' optimal refractive correction and when monocularly blurred with ±1.00 DS and ±2.00 DS lens over the dominant eye. Adaptive gait measurements for the lead and trail foot included foot position before the raised surface, toe clearance of the raised surface edge, and foot position on the raised surface. Vision measurements included binocular visual acuity, contrast sensitivity, and stereoacuity. RESULTS: Equal levels of monocular positive and negative spherical lens blur led to very different stepping strategies when negotiating a raised surface. Positive blur lenses led to an increased vertical toe clearance and reduced distance of the lead foot position on the raised surface. Negative lenses led to the opposite of these changes. CONCLUSIONS: Findings suggest that step negotiation strategies were driven by the magnification effect provided by the spherical lenses. Steps appeared closer and larger with magnification from positive lenses and further away and smaller with minification from negative lenses and gait was adjusted accordingly. These results suggest that previously reported adaptive gait changes to monocular spherical lens blur were not safety strategies as previously suggested but driven by lens magnification. The significance of these findings in terms of prescribing large refractive changes in frail older patients is discussed.

Item Type: Article
Themes: Health and Wellbeing
Schools: Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title: Optometry and Vision Science
Publisher: Lippincott, Williams & Wilkins
Refereed: Yes
ISSN: 1040-5488
Depositing User: Dr Graham Chapman
Date Deposited: 18 Oct 2011 12:59
Last Modified: 27 Aug 2021 20:01
URI: http://usir.salford.ac.uk/id/eprint/18482

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