👁️ Nystagmus or Dancing Eyes – What You Should Know Nystagmus is a condition characterized by involuntary, rapid, and repetitive movements of the eyes, often described as dancing eyes. These movements can occur in various directions—horizontal, vertical, or circular—and may affect one or both eyes. Nystagmus can be present at birth (congenital) or develop later in life (acquired). Common causes include neurological conditions such as stroke, brain tumors, or multiple sclerosis; head trauma; inn