#nystagmus__nystagmu  involuntary movements of the eyeballs; the presence or absence of nystagmus is used to diagnose a variety of neurological and visual disorders
  supertype:  #position_change__movement__move__motility  a change of position that does not entail a change of location; "the reflex motion of his eyebrows revealed his surprise"; "movement is a sign of life"; "an impatient move of his hand"; "gastrointestinal motility"
  subtype:  #physiological_nystagmus__physiologicalnystagmu  small involuntary tremors of the eyeballs; when physiological nystagmus is eliminated by stabilizing the image on the retina the perception fades rapidly from fatigue of the retinal receptors
  subtype:  #rotational_nystagmus  nystagmus caused by the body rotating rapidly; large slow movements of the eyeballs are in the direction of rotation
  subtype:  #post-rotational_nystagmus  nystagmus caused by suddenly stopping the rapid rotation of the body; large slow movements of the eyeballs are in the direction opposite to the direction of rotation

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