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The horizontal gaze nystagmus test involves asking a subject to focus on an object such as a pen held about a foot away, just above eye level, and to follow the object as the test administrator moves it from side to side.
ENG testing included calibration, identification of spontaneous nystagmus and gaze nystagmus, positional tests, Dix-Hallpike maneuvers (unless contraindicated because of neck pathology), sinusoidal tracking, optokinetic testing and, in selected patients, alternate binaural bithermal caloric testing (right warm [RW]; right cool [RC]; left warm [LW]; left cool [LC]).
For example, the horizontal gaze nystagmus test, one of the "standardized" battery of field sobriety tests used in most states, is of questionable value in determining a person's sobriety, and few police officers can administer it or interpret its results correctly.
HawkEye is especially relevant in refining officers' identification of Horizontal Gaze Nystagmus ('HGN'), certainly the most sensitive and evidentiary component of the Standardized Field Sobriety Test.