Nystagmus is a disorder hystricalder characterized but involuntary rhythmic oscillatory movements of eyeball nystagmus most commonly causes the eye to  look involuntary from side to side swing motion rather than staying fixed on an object or person, however, some nystagmuses  cause eye to jerk side on or up and down  nystagmus can be Fine Medium Course: It is classified as Congenital Infantile Manifest Manifest latent Acquired Latent The other simple way of classifying nystagmus is  Physiological in this we have optokinetic nystagmus Latent Deviational Spasms nutans Spontaneous in this Occupational nystagmus Central defective vision Total blindness other causes: Lesion of CNS and spinal cord Vestibular and labyrinthine Cong or idiopathetic Hysterical Share your opinion.