What characterizes nystagmus?

Nystagmus is primarily characterized by involuntary rapid eye movements. This condition can manifest as oscillatory movements of the eyes, which may be horizontal, vertical, or rotary in nature. The rapid contractions and relaxations of the eye muscles result in these quick movements that can be pronounced and noticeable, especially when an individual attempts to focus on a specific object.

While other symptoms like reduced eye contact, difficulty focusing, or blurred vision during movement may accompany certain visual or neurological conditions, they do not accurately define nystagmus itself. The essence of nystagmus lies specifically in the involuntary motion of the eyes rather than the effects those movements might have on visual acuity or interaction. Thus, understanding that involuntary rapid eye movements are the hallmark of nystagmus is crucial in recognizing and diagnosing the condition.