a portable virtual reality device is disclosed that will facilitate the effective and efficient screening for tbi in military personnel in forward deployed military settings or remote locations using minimally trained staff . this includes the establishment of a protocol that will provide cost effective pre - screening of military personnel prior to deployment to establish a baseline of brain function prior to possible future injury . the efficiency of the device will promote subsequent follow - up screening to assess the effectiveness of prescribed tbi treatment . further protocols for diagnosis and rehabilitation applications using the same virtual reality portable device will allow more advanced usage for clinicians providing ongoing evaluation and treatment .