The Effect of target speed and verbal instruction on NPC measures in a young, healthy, and active population

  • Ian McGinnis Temple University
  • Ryan Tierney Temple University
  • Jamie Mansell Temple University
  • Jacqueline Phillips Temple University
Keywords: Eye movement, convergence, attention, concussion, convergence insufficieny, assessment

Abstract

Purpose: Evaluate the effect of target speed and verbal instruction on near point of convergence (NPC) measurements in a young, healthy, and active population. Methods: NPC was measured in 20 individuals with three target speeds and two sets of verbal instruction. The target speeds used were 1 cm/s, 3 cm/s, 5 cm/s, and participant self-paced. The verbal instruction given was either to indicate when the target became “double” or “blurry”. Results: Paired-samples t-tests revealed significant differences between 5 cm/s (5.44 ± 2.01) and 1 cm/s (6.72 ± 2.39, p = .003), 3 cm/s (6.10 ± 2.36, p = .030) and self-paced (6.63 ± 2.26, p = .005). A significant difference (p < .001) was also found between the “double” (6.72 ± 2.39) and “blurry” (10.82 ± 3.08) conditions Conclusion: For young, healthy and active individuals, target speed and verbal instruction matter when measuring NPC.

Author Biographies

Ryan Tierney, Temple University

Department of Kinesiology, Associate Professor

Jamie Mansell, Temple University

Department of Kinesiology, Athletic Training Program Director

Jacqueline Phillips, Temple University

Department of Kinesiology, Assistant Professor

Published
23-10-2019
How to Cite
McGinnis, I., Tierney, R., Mansell, J., & Phillips, J. (2019). The Effect of target speed and verbal instruction on NPC measures in a young, healthy, and active population. Journal of Eye Movement Research, 12(4). https://doi.org/10.16910/jemr.12.4.5