What type of eye movement characterizes Horizontal Gaze Nystagmus?

The characteristic eye movement associated with Horizontal Gaze Nystagmus is an involuntary jerking movement. This type of nystagmus occurs when the eyes move side to side and display a distinct pattern of reaction, particularly when tracking a moving object.

In Horizontal Gaze Nystagmus, individuals may not have control over these movements, and the jerking is often exacerbated when the individual is under the influence of substances like alcohol. This involuntary aspect helps to differentiate it from other types of eye movements, such as voluntary smooth movements, which are controlled by the individual.

Understanding that Horizontal Gaze Nystagmus involves an involuntary response provides crucial insight, especially in the context of field sobriety tests where evaluating eye movement can indicate potential impairment.