The King-Devick Test in association with Mayo Clinic is an accurate and reliable method for identifying athletes with head trauma and has particular relevance to football, hockey, soccer, basketball, lacrosse, rugby, baseball, softball and other contact and collision activities.


The K-D Test is easy to administer, and should be used on the sidelines of sporting events to aid in the detection of concussions in athletes, and objectively determine whether players should be removed from play to receive additional medical attention.

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Detecting Concussions

Concussions are a complex type of brain injury that are not typically visible on routine scans of the brain, yet are detectable when important aspects of brain function are measured, including vision. The eyes are actually part of the brain; therefore, the visual pathways give a widespread overview of what’s happening with the brain during concussion. Impaired eye movements can be apparent even when athletes appear to be asymptomatic or “fine” after a suspected head injury.

Did you know that the eyes are really part of the brain? Vision alone accounts for >55% of the brain’s pathways.

King-Devick Test is a validated, accurate and objective remove-from-play sideline concussion screening test. With results in less than two minutes, trained parents, coaches, athletic trainers, and medical professionals can quickly assess if an athlete requires additional medical attention.


King-Devick Test® (K-D Test®) All rights reserved. Copyrighted. ©1983, 2010-2018, Patents-Pending. Mayo and Mayo Clinic are registered trademarks owned by Mayo Foundation for Medical Education and Research. Two Mid America Plaza, Suite 110, Oakbrook Terrace, IL 60181. King-Devick Test is for screening purposes only and any suspicion or indication of head trauma should be evaluated by a licensed professional.