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HGN Cheat Sheet: A Comprehensive Guide to Horizontal Gaze Nystagmus
"Horizontal Gaze Nystagmus (HGN) is a physiological phenomenon frequently utilized in the field of forensic science and law enforcement as a primary indicator of impairment. Understanding the mechanisms of HGN, how it is tested, and the limitations of these assessments is critical for anyone involved in legal, medical, or safety-related fields. This guide serves as an expert reference for the stages of the HGN test and the physiological basis behind involuntary eye movements. The Physiological Basis of Horizontal Gaze Nystagmus At its core, HGN is the involuntary jerking or oscillation of the eyes as they gaze to the side. Under normal physiol..."
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