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The Effect of Degrading Binocular Single Vision on Fine Visuomotor Skill Task Performance

Piano, ME and O'Connor, AR (2013) The Effect of Degrading Binocular Single Vision on Fine Visuomotor Skill Task Performance Investigative ophthalmology & visual science, 54 (13). pp. 8204-8213.

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Abstract

Purpose.: To evaluate the impact of degrading binocular single vision (BSV) on performance of fine visuomotor skill tasks requiring speed/accuracy. Methods.: Binocular functions (Frisby/Preschool Randot [PSR] stereoacuity, horizontal phasic prism fusion amplitudes) were measured in visually normal participants aged 18 to 40 years (n = 80). Participants performed 2-timed visuomotor tasks: water pouring (450 mL accurately into five measuring cylinders at 90 mL) and bead threading on upright needles (30 large, 22 small beads, creating two difficulty levels). Task and binocular function measures were repeated in a randomized order with monocular visual acuity (VA) reduced in three-line increments using convex spherical lenses. Analyses used were Kruskal-Wallis/Mann-Whitney U tests and linear mixed modeling. Results.: Median Frisby stereoacuity levels were 20″ arc at baseline, 55″ arc when VA was degraded by 6 lines, 210″ arc by 9 lines, and unmeasurable by 12 lines (9 lines in some individuals). Task performance times deteriorated for the large bead task (7%–10% between lenses, total 37% from median baseline time of 51 seconds, P < 0.001), and small bead task (0.5%–15% between lenses, total 42% from median baseline time of 57 seconds, P < 0.001). Binocular function measures causing significant fixed effects were base-out fusional amplitudes in both bead tasks (large: P = 0.010, small: P = 0.011) and PSR stereoacuity in the small bead task (P = 0.047). Water-pouring task performance was not significantly affected by changes in any experimental parameter. Conclusions.: Degrading motor fusion as well as stereoacuity significantly affects performance in certain fine visuomotor tasks. This impact is differentially affected by task difficulty.

Item Type: Article
Subjects : Medical Science
Divisions : Faculty of Health and Medical Sciences > School of Health Sciences
Authors :
AuthorsEmailORCID
Piano, MEUNSPECIFIEDUNSPECIFIED
O'Connor, ARUNSPECIFIEDUNSPECIFIED
Date : December 2013
Identification Number : 10.1167/iovs.12-10934
Copyright Disclaimer : Copyright 2013 The Association for Research in Vision and Ophthalmology, Inc.
Uncontrolled Keywords : Binocular vision, Fine motor tasks, Motor fusion, Stereopsis
Depositing User : Symplectic Elements
Date Deposited : 05 Aug 2016 10:48
Last Modified : 05 Aug 2016 10:48
URI: http://epubs.surrey.ac.uk/id/eprint/811613

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