Nystagmus

Nystagmus /nɪˈstæɡməs/ is a condition of involuntary eye movement, acquired in infancy or later in life, that may result in reduced or limited vision.

There are two key forms of nystagmus: pathological and physiological, with variations within each type. Nystagmus may be caused by congenital disorders, acquired or central nervous system disorders, toxicity, pharmaceutical drugs, alcohol, or rotational movement. Previously considered untreatable, in recent years several pharmaceutical drugs have been identified for treatment of nystagmus. Nystagmus is occasionally associated with vertigo.