Abstract
We thank Drs. Handmaker and Waldorf for their helpful comments regarding our article, entitled “The King–Devick test and sports-related concussion: Study of a rapid visual screening tool in a collegiate cohort.” The authors are correct that eye movements were not recorded as part of the studies of the collegiate athlete cohort, and that other sources of impairment may be influencing King–Devick (K–D) time scores both at preseason baseline testing and at the time of concussion sideline testing. K–D is a test for which eye movements are required to perform the task of rapid number naming; as such, future studies that incorporate formal recordings of saccades and other eye movements will be helpful. Factors such as reading ability may also affect the time required for a rapid number naming task, thus emphasizing the need for baseline testing to use for comparison to sideline measurements in the event of a concussion.
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