May 2007
Volume 48, Issue 13
ARVO Annual Meeting Abstract  |   May 2007
Effect of Monocular Blur on Adaptive Gait
Author Affiliations & Notes
  • A. Vale
    University of Bradford, Bradford, United Kingdom
  • J. G. Buckley
    University of Bradford, Bradford, United Kingdom
  • A. Scally
    University of Bradford, Bradford, United Kingdom
    Institute of health research,
  • D. B. Elliott
    University of Bradford, Bradford, United Kingdom
  • Footnotes
    Commercial Relationships A. Vale, None; J.G. Buckley, None; A. Scally, None; D.B. Elliott, None.
  • Footnotes
    Support College of Optometrists
Investigative Ophthalmology & Visual Science May 2007, Vol.48, 1574. doi:
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      A. Vale, J. G. Buckley, A. Scally, D. B. Elliott; Effect of Monocular Blur on Adaptive Gait. Invest. Ophthalmol. Vis. Sci. 2007;48(13):1574.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements

Purpose:: Monocular blur may cause a reduction in contrast sensitivity by binocular inhibition and has been shown to increase stereoacuity thresholds more than binocular blur of the same magnitude. When negotiating obstacles/steps under conditions of binocular blur subjects adopt a strategy of increasing toe clearance to reduce the risk of tripping, but as yet no studies have investigated if monocular blur will lead to a similar adaptation. The present study determined how toe clearance and stepping kinematics was affected by monocular blur or occlusion.

Methods:: 14 healthy subjects (age 25.8±5.64) with normal vision walked along the laboratory onto a raised surface. Trials were performed with optimal refractive correction, 2 dioptre blur over the dominant or non-dominant eye or the dominant eye occluded. Foot placement and limb kinematics were analyzed via 3D motion analysis.

Results:: Stereopsis was reduced to 257secs of arc (dominant eye blurred) and 153 secs of arc (non-dominant eye blurred). Analysis shows an 18% (p<0.001) increase in vertical toe clearance when the dominant eye is blurred but only a 10% increase (p<0.001) when the non-dominant eye was blurred. The trail (support) foot was placed further from the step (p<0.001) and knee and hip flexure increased when each eye was blurred or the dominant eye occluded.

Conclusions:: We conclude that a relatively small amount of monocular blur (which leads to a reduction in stereopsis) can cause uncertainty in locating the step edge and increase vertical toe clearance to increase margins of safety. Blur in front of the dominant eye had a greater effect on step adaptations to blur in front of the non-dominant eye.

Keywords: vision and action • binocular vision/stereopsis • spectacle lens 

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.