June 2021
Volume 62, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2021
Comparing fixational stability of D1 baseball players as measured by Tracking Scanning Laser Ophthalmoscopy to healthy controls
Author Affiliations & Notes
  • Eric Van Meter
    Arizona College of Optometry, Midwestern University, Glendale, Arizona, United States
  • Judy Tran
    Arizona College of Optometry, Midwestern University, Glendale, Arizona, United States
  • Zachary Green
    Arizona College of Optometry, Midwestern University, Glendale, Arizona, United States
  • Christy Sheehy
    C. Light Technologies, Berkeley, California, United States
  • Jacqueline Theis
    Sports Vision and Concussion Clinic, University of California at Berkeley School of Optometry, Berkeley, California, United States
  • Ethan A Rossi
    Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
    Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
  • Hope Reecher
    Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
  • Min Zhang
    Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
  • Charlotte Bolch
    Office of Research and Sponsored Programs, Midwestern University, Glendale, Arizona, United States
  • Nicole M Putnam
    Arizona College of Optometry, Midwestern University, Glendale, Arizona, United States
  • Footnotes
    Commercial Relationships   Eric Van Meter, None; Judy Tran, None; Zachary Green, None; Christy Sheehy, C. Light Technologies (I), C. Light Technologies (P); Jacqueline Theis, C. Light Technologies (C); Ethan Rossi, None; Hope Reecher, None; Min Zhang, None; Charlotte Bolch, None; Nicole Putnam, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2021, Vol.62, 509. doi:
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      Eric Van Meter, Judy Tran, Zachary Green, Christy Sheehy, Jacqueline Theis, Ethan A Rossi, Hope Reecher, Min Zhang, Charlotte Bolch, Nicole M Putnam; Comparing fixational stability of D1 baseball players as measured by Tracking Scanning Laser Ophthalmoscopy to healthy controls. Invest. Ophthalmol. Vis. Sci. 2021;62(8):509.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : To compare Tracking Scanning Laser Ophthalmoscopy (TSLO) measurements of eye fixation in elite D1 baseball players against a control group of healthy, non-baseball players as a preliminary investigation into the mechanism of Quiet Eye.

Methods : Thirty-four young, healthy control subjects (CS) (19F, 15M) aged 13-27 and 26 male D1 baseball players (BP) aged 18-22 participated in the study. For the CS analysis, two 30-second videos were split into three, separate 10-second recordings. Subjects were instructed to fixate on the upper right corner of a 5°x 5° 840nm imaging raster. For the BP, at least three 10-second videos were recorded per eye utilizing the same fixation stimuli and instructions as the CS. Offline, custom MATLAB software was used to stabilize the videos, extract eye motion at 480Hz, and compute microsaccade amplitude, peak velocity, peak acceleration, drift proportion, and drift amplitude. The bivariate contour ellipse area (BCEA) was calculated for each participant.

Results : A mixed effects model was conducted for each fixation measure to see if there was a difference in means (SD) between BP versus CS. Microsaccade mean amplitude was 0.30° (0.15) vs 0.46° (0.21) for BP vs CS (p<0.005). Microsaccade mean peak velocity was 38.99°/sec (24.85) vs 79.68°/sec (49.13) for BP and CS (p<0.0005). Microsaccade peak acceleration was 10510.05°/sec2 (9742.58) vs 30997.33°/sec2 (22431.55) for BP vs CS (p<0.0001). Drift proportion was 0.88 (0.09) vs 0.84 (0.08) for BP vs CS (p<0.05). BCEA of the drift was 0.10°2 (0.13) vs 0.22°2 (0.21) for BP vs CS (p<0.005). There was no statistically significant difference in drift amplitude between BP and CS.

Conclusions : D1 baseball players exhibited more stable fixations in performing the given fixation task on TSLO as demonstrated by smaller mean microsaccade amplitudes, velocity, acceleration, and greater drift proportion. Whether this increased fixational stability is the result of an innate ability or is the result of the visual training required to play the visually demanding sport of baseball is still undetermined and warrants further investigation. Additional evaluation of eye motion with TSLO may provide promising insight into the mechanisms of Quiet Eye and on-field performance for baseball players in sports vision.

This is a 2021 ARVO Annual Meeting abstract.

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