What does "gaze nystagmus" refer to?

Gaze nystagmus refers to abnormal involuntary eye movements, which can occur in various directions when the eyes are tracking a point or object. This condition is often observed during sobriety tests such as the Horizontal Gaze Nystagmus (HGN) test, where trained officers examine the eyes of individuals suspected of intoxication or impairment. The presence of these abnormal eye movements can indicate a lack of control or coordination, often linked to alcohol or drug influence.

While methods for testing sobriety and the ability to focus are related to the topic, they do not specifically define what gaze nystagmus entails. Gaze nystagmus is primarily characterized by these involuntary movements, which serve as indicators in assessments of sobriety or neurological function.