The present disclosure provides a system including one or more sensors, a mounting system configured to removeably mount a computing device such that a camera of the computing device is positioned facing an eye of a subject, and a control system. The control system is configured to (a) receive sensor data from the one or more sensors, (b) determine whether the sensor data is indicative of balance instability of the subject, (c) track a position of the eye of the subject to assess vestibular dysfunction, (d) determine whether the camera data is indicative of vestibular dysfunction of the subject, and (e) in response to (i) the sensor data being indicative of balance instability of the subject and/or (ii) the camera data being indicative of vestibular dysfunction of the subject, display an indication of symptoms that are characteristic of a traumatic brain injury or concussion.