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Effect of reduced visual acuity on precision of two-dimensional tracing movements
Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, University of Gävle, Gävle, Sweden.
Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, University of Gävle, Gävle, Sweden.
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Low Vision Centre, Örebro County Council, Örebro, Sweden; Centre for Rehabilitation Research, Örebro County Council, Örebro, Sweden; .ORCID iD: 0000-0002-6364-2145
Örebro University, School of Law, Psychology and Social Work. Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Centre for Rehabilitation Research, Örebro County Council, Örebro, Sweden.
2016 (English)In: Journal of Optometry, ISSN 1888-4296, Vol. 9, no 2, 93-101 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: We intended to assess consequences of reduced visual acuity for performance in a natural simple motor task (tracing) using objective kinematic performance measures. Specifically, we intended to elucidate the kind of relationship between the task performance and best corrected binocular visual acuity and to determine the threshold of visual acuity when task performance starts to deteriorate.

Methods: Ninety-five individuals with different best corrected visual acuity participated in the study (age 49±12 years, mean±SD, 27 men and 68 women). The participants manually traced maze-like visual patterns of different spatial complexity presented on the screen of a portable notebook computer using Clinical Kinematic Assessment Tool software. Tracing error was computed as performance measure in each trial with a spatial pattern matching technique - rigid point set registration method.

Results: The segmented linear regression analysis showed that the relation between visual acuity and tracing errors was best described with a regression function having a break point between two data segments. Tracing performance was unaffected by values of visual acuity below 0.2 on logMAR scale, but when logMAR values increased above this critical limit (i.e. when visual acuity is further reduced), tracing errors linearly increased. The rate of the increase of the tracing error correlated with the complexity of visual stimulus shape.

Conclusion: Testing of fine motor functions with objective kinematic measures during visuomotor tasks may help differentiating between actual effects of reduced visual acuity on eye-hand coordination in individuals with similar levels of impairment of visual acuity.

Place, publisher, year, edition, pages
Madrid, España: Spanish Council of Optometry , 2016. Vol. 9, no 2, 93-101 p.
Keyword [en]
Eye-hand coordination, tracing, Visual acuity, low vision
National Category
Ophthalmology
Identifiers
URN: urn:nbn:se:oru:diva-49668DOI: 10.1016/j.optom.2015.03.003PubMedID: 26002409Scopus ID: 2-s2.0-84929603184OAI: oai:DiVA.org:oru-49668DiVA: diva2:919222
Available from: 2016-04-13 Created: 2016-04-05 Last updated: 2017-10-17Bibliographically approved

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