Evaluation of the Commercial, Off-the-Shelf (COTS) King-Devick Eye Tracking System
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL FORT RUCKER
Pagination or Media Count:
The identification and characterization of sensitive biomarkers for concussion are important for military medicine to guide diagnosis and return to duty decisions. The current literature suggests that the King Devick KD number reading test is a sensitive screener for concussion sustained during sports activities. The KD test involves timing an individual reading aloud 120 single digit numbers, without error, printed on three standard cards timing is performed with a stopwatch. The extensive literature commonly describes the KD test as revealing the disruption of eye movements that could be due to a number of factors including concussion. Thus, the test is sensitive if not necessarily specific. The extent to which the KD test reflects eye movements remains a matter of conjecture since it is a measure of gross behavioral reading performance. Hence, it is important to objectively measure eye movements concurrently with the performance of the KD test. Recently, a commercial, off-the-shelf COTS, integrated KD Eye Tracking system became available. Because of the potential importance of the contributions of this system to concussion research, two copies of the system were purchased and evaluated before they were deployed for research. The evaluation consisted of two studies one study with 20 volunteers measured the comparability of the two systems, while the other study with 5 volunteers assessed the stability and repeatability of the measurements over 5 successive days. The results showed that several response parameters of the systems lacked face validity, calling into question the validity of the eye tracking data. Thus, we have not used these systems for further research.
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