AI Article Synopsis
- Concussion biomarkers assist in diagnosis and decision-making for return-to-duty protocols, with the King-Devick (KD) test recognized as a sensitive screener for sports-related concussions.
- The KD test measures reading performance but only reports speed and errors, leaving questions about its validity in assessing eye movements related to concussions.
- Evaluations of two computerized KD systems revealed issues with the reliability and validity of their eye movement parameters, stressing the need for thorough testing of new research equipment before use.
Article Abstract
Concussion biomarkers are important guides for diagnosis and return-to-duty decisions. Recent literature describes the King-Devick (KD) test as a sensitive sports-related concussion screener. This test involves timing an individual reading aloud 120 digits printed on three test cards. The test is commonly considered to evaluate the effects of concussion and other factors on reading-related eye movements (EMs). However, the extent to which the KD test reflects EMs remains a matter of conjecture since the test reports only reading speed and number of errors. An off-the-shelf, computerized KD with eye tracking system recently became commercially available. Two early model KD with eye tracking systems were purchased in 2015 and evaluated before deploying them for research. The evaluation consisted of two studies; one with 20 volunteers assessing the comparability of the two systems and the other with 5 volunteers to quantify the systems' stability and repeatability over 5 successive days. The results showed that several of the systems' reported EM response parameters lacked face validity; consequently, the systems could not be used for scientific research. This conclusion emphasizes the importance of systematic test and evaluation of new equipment before it is used for research.
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| http://dx.doi.org/10.1093/milmed/usy380 | DOI Listing |
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