The purpose of this study is to determine the sensitivity and specificity of an aid in assessment of concussion based on eye-tracking, in comparison to a clinical reference standard appropriate for the Emergency Department (ED) or concussion clinic.

Inclusion Criteria:

• Provide written informed consent.
• Be between the ages of 4 and 67 years old.
• Have a diagnosis of traumatic brain injury with a potential for concussion.
• Subjects must have baseline vision correctable to within 20/500 bilaterally.
• Subjects must have intact ocular motility.
• Subjects must have ability to provide a complete ophthalmologic, medical and neurologic history as well as medications/drugs/alcohol consumed within the 24 hours prior.

Exclusion Criteria:

• ER visit has been more than 2 weeks since the injury which may have caused the concussion.
• Have received penetrating trauma or have a head CT demonstrating evidence of acute brain injury (subdural, epidural or intraparenchymal hemorrhage, edema/mass effect per attending radiologist read).
• Suffering burns, anoxic injury or multiple/extensive injuries resulting in any medical, surgical or hemodynamic instability.
• Blind (no light perception), are missing eyes, do not open eyes.
• It is pertinent that subjects be able to detect light and have both eyes in order for the eye tracking data to be effective and significant.
• Previous history of: ocular motility dysfunction or extensive prior eye surgery.
• Any physical or mental injury or baseline disability rendering task completion difficult.
• Obvious intoxication or blood alcohol level greater than 0.2.

Participants will include all patients evaluated for potential traumatic brain injury presenting to the Emergency Department or concussion clinic.