title: Treatment of acquired nystagmus with botulinum neurotoxin A.
abstract: OBJECTIVE
  Acquired nystagmus may cause oscillopsia and in some cases decreased visual acuity. Such symptoms may be debilitating. We evaluated the efficacy of retrobulbar botulinum neurotoxin A in the visual rehabilitation of patients with acquired symptomatic nystagmus.
  
  
  METHODS
  Adults with acquired nystagmus from multiple sclerosis or brain-stem hemorrhage were recruited for this treatment study. Eligible patients were unable to perform visual tasks that they had performed prior to the onset of the nystagmus.
  
  
  METHODS
  A prospective study evaluated the results of the retrobulbar injection of 25 to 30 U of botulinum neurotoxin A. Patients underwent testing of visual function, including eye movement recordings before and after initial injections. Patients were followed up for changes in their visual function for at least 6 months following the last injection.
  
  
  RESULTS
  Six patients (nine eyes) with acquired nystagmus were treated with a series of 17 injections of retrobulbar botulinum neurotoxin A. Each patient had subjective and objective improvement in distance visual acuity following the injection. A reduction in the amplitude of the nystagmus was seen following each of the injections, but the frequency of the nystagmus was generally unchanged. Visual improvement usually lasted no more than 8 weeks. However, improvement persisted for 6 months after injection in two patients with oculopalatal myoclonus.
  
  
  CONCLUSIONS
  Botulinum neurotoxin A transiently improves the visual function of patients with acquired nystagmus. For patients with oculopalatal myoclonus the improvement seems to last longer, about 6 months in two patients.
authors.affiliation: Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, Md.
authors.forename: M X
authors.initials: MX
authors.lastname: Repka
authors.forename: P J
authors.initials: PJ
authors.lastname: Savino
authors.forename: R D
authors.initials: RD
authors.lastname: Reinecke
mesh_terms: D000328:Adult; D000368:Aged; D001905:Botulinum Toxins / Q000008:administration & dosage / Q000627:therapeutic use*; D004584:Electronystagmography; D005133:Eye Movements / Q000502:physiology; D006801:Humans; D007267:Injections; D008875:Middle Aged; D009759:Nystagmus, Pathologic / Q000503:physiopathology / Q000628:therapy*; D011446:Prospective Studies; D014792:Visual Acuity
chemical_list: D001905:Botulinum Toxins