Document Detail

The Effects of Vertical Yoked Prisms on Gait.
MedLine Citation:
PMID:  23611995     Owner:  NLM     Status:  Publisher    
PURPOSE. To investigate the influence of base down (BD) and base up (BU) yoked prism wear on gait. METHODS. Gait was assessed in thirty-one young healthy adults (mean age 24.0 ± 5.1 years) during and after wearing 5 prism dioptre (Δ) BU yoked prisms, 5Δ BD yoked prisms and plano (PL) (zero power - control condition) lenses, worn in a pseudo-random order. Velocity, cadence, step length, double support phase, step width, and variability in step time, step width, step length and swing time were measured as participants walked at a freely chosen walking speed along a 5.3 m electronic mat placed in the centre of a 7.5 m walkway. Gait parameters were analysed for each viewing condition before, during and after prism wear. RESULTS. BD yoked prisms, when compared with PL, led to slower velocity, lower cadence, decreased step length and increased step time variability (p≤0.001) These gait parameters did not significantly differ between BU yoked prisms and PL lenses (p> 0.05). Measurements taken immediately on removal did not differ from those taken after a time delay of 5 minutes. CONCLUSIONS. BD yoked prisms affected gait in young healthy adults walking across an unobstructed path at their freely chosen walking speed, in that participants adopted a slower, apparently more cautious gait pattern; BU yoked prisms did not significantly affect gait. The effect of BD prism on gait may be due in part to a perception of increased height.
Jodie A Errington; Jasmine C Menant; Catherine M Suttle; Jessica Bruce; Lisa J Asper
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-4-23
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  -     ISSN:  1552-5783     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-4-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
School of Optometry and Vision Science, University of New South Wales, Sydney, Australia.
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