title: The resilience of natural interceptive actions to refractive blur.
abstract: The impact of refractive visual blur on interceptive skill was examined for a series of highly-demanding striking tasks. Ten skilled cricket batsmen were required to intercept balls projected by either a ball projection-machine (medium-pace only) or cricket bowlers (two velocities; medium-pace and fast-pace) under each of four systematically varied visual conditions. Contact lenses were fitted to simulate increments in refractive blur (habitual, +1.00, +2.00, +3.00D), with changes in interceptive performance evaluated on three concurrent measures of performance relevant to cricket batting (quality of bat-ball contact, forcefulness of bat-swing, and likelihood of dismissal). For the projection-machine condition, results replicate those reported previously (Mann, Ho, De Souza, Watson, & Taylor, 2007) with blur needing to reach +3.00D before any significant decreases in performance were evident, a finding further replicated when facing bowlers of comparable velocity. The influence of blur on interception was found to interact with ball-velocity, with the increased temporal demands of fast-paced trials resulting in decreased performance becoming evident at a lower level of blur (+2.00D). The findings demonstrate that even when presented with a situation replicating highly-demanding performance conditions, substantial degradation of visual clarity is possible before acuity is a limiting factor for interceptive performance.
authors.affiliation: School of Optometry and Vision Science, University of New South Wales, Australia. d.mann@unsw.edu.au
authors.forename: David L
authors.initials: DL
authors.lastname: Mann
authors.forename: Bruce
authors.initials: B
authors.lastname: Abernethy
authors.forename: Damian
authors.initials: D
authors.lastname: Farrow
mesh_terms: D003163:Competitive Behavior; D003867:Depth Perception; D006801:Humans; D008297:Male; D011361:Professional Competence; D011597:Psychomotor Performance / Q000502:physiology*; D013177:Sports; D014743:Videotape Recording; D014796:Visual Perception; D055815:Young Adult