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dc.contributor.authorJohnson, Louise*
dc.contributor.authorElliott, David B.*
dc.contributor.authorBuckley, John G.*
dc.date.accessioned2015-01-06T14:51:39Z
dc.date.available2015-01-06T14:51:39Z
dc.date.issued2009
dc.identifier.citationJohnson, L., Elliott, D. B. and Buckley, J. G. (2009) Effects of gaze strategy on standing postural stability in older multifocal wearers. Clin Exp Optom, 92 (1), 19-26.
dc.identifier.urihttp://hdl.handle.net/10454/6941
dc.description.abstractBACKGROUND: Postural instability in older people is associated with an increased risk of falling. This experiment investigated the effects of different gaze strategies on postural stability in older people, when using distance single-vision compared with multifocal (progressive addition lens and bifocal) spectacles. METHODS: Eighteen healthy older habitual multifocal spectacle-wearers (mean age 72.1 +/- 4.0 years) participated in a randomised, cross-over study. Postural stability during quiet standing was assessed as the root mean square excursion in the centre of pressure (RMS-COP) in the antero-posterior direction. Ground reaction force data were collected (for 30 seconds), while subjects viewed one of two visual targets (one square metre) of different spatial frequencies and contrasts, while wearing either distance single-vision or multifocal (progressive addition and bifocal) spectacles. The visual targets were positioned either ahead at eye-level or on the ground (viewing distance 2.06 metres) and viewed under the following head-gaze conditions; 'head neutral-gaze forward', 'head flexed-gaze down' and 'head neutral-gaze down'. RESULTS: The type of spectacles worn or the target viewed had no significant effect on postural stability but postural stability deteriorated (antero-posterior RMS-COP excursion increased) in the 'head neutral-gaze down' compared with the 'head flexed-gaze down' and 'head neutral-gaze forward' conditions (5.9, 5.5 and 5.0 mm respectively, p < 0.001). CONCLUSIONS: Multifocal use had no effect on standing postural stability. Irrespective of spectacles worn, when fixating a visual target positioned at ground level, postural stability was better in the 'head flexed-gaze down' condition compared with the 'head neutral-gaze down' condition. A useful strategy to reduce falling in the older person might be to advise multifocal and distance single-vision spectacle-wearers to flex their heads rather than just lower their eyes when looking downwards.
dc.relation.isreferencedbyhttp://dx.doi.org/10.1111/j.1444-0938.2008.00304.x
dc.subject*Accidental Falls
dc.subjectAged
dc.subjectContrast Sensitivity/physiology
dc.subjectCross-Over Studies
dc.subjectDepth Perception/physiology
dc.subjectEye Movements/physiology
dc.subjectEyeglasses/*adverse effects
dc.subjectFemale
dc.subjectFixation, Ocular/*physiology
dc.subjectHumans
dc.subjectMale
dc.subjectMiddle Aged
dc.subjectPhotic Stimulation
dc.subjectPostural Balance/physiology
dc.subjectPosture/*physiology
dc.subjectPsychomotor Performance/*physiology
dc.subjectVisual Acuity/physiology
dc.titleEffects of gaze strategy on standing postural stability in older multifocal wearers
dc.typearticle


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