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

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