High levels of visual acuity are required to hit a baseball
effectively. Research has shown that any decrease in vision is likely caused by low-order optical aberrations. This study is designed to validate the SVOne
autorefractor, and describe the amount and type, of low-order optical aberrations present in a large cohort of professional baseball
A retrospective chart review on the 608 Major League Baseball
players evaluated during the 2016 Spring Training Season was performed. Results for a subset of players who had both manifest refraction as well as autorefraction
were calculated. Subsequently, after determining the accuracy of the autorefraction
system in this population, refractive results for the entire population were determined.
There was a borderline statistically significant difference in mean spherical refractive error
(M) between the manifest refraction and the SVOne
auto refraction (−0.273D in the manifest refraction method vs. −0.503D in the SVOne
= .06) in the subset of athletes who underwent both tests. Additionally, there was no difference in the J0
cylindrical component vectors for each method. For the entire eligible population, the SVOne autorefraction
system found a mean spherical refractive error
(M) of −0.228D, a J0
value of −0.013D, and a J45
value of −0.040D.
These data suggest that the SVOne autorefraction
system is generally able to measure the refractive error
in the baseball
population. The system was slightly biased, often reporting more myopia in myopic subjects. Thus, careful evaluation of the refractive status of these athletes coupled with careful subjective refractive correction for those with less than average vision for baseball
is strongly suggested.