King-Devick Test in association with Mayo Clinic is an evidence-based, accurate and objective remove-from-play sideline concussion screening test. According to studies, 85% of . Devick® (KD) test is a rapid, easy-to-administer eye movement test developed in , and used to assess dyslexia and other learning disabilities (5). In recent studies, the KD test has been. The King-Devick (K-D) test, a rapid vision-based performance measure of rapid number naming, has been examined in a range of athletes