title: [Pronounced physiological pupillary hippus].
abstract: BACKGROUND
  The term "hippus" describes pupillary oscillations of variable amplitude and frequency and may be physiological or part of a pathological entity. Thus, pupillary hippus is often the target of extensive clinical investigation.
  
  
  METHODS
  A 9-year-old boy was seen in our emergency room in March 1998. Examination showed distinct pupillary oscillations in the absence of any other pathological findings. We presented the patient to a pediatric neurologist. Apart from a history of enuresis and of motor tics in the neck region, the present neurological examination was normal.
  
  
  CONCLUSIONS
  Even a pronounced hippus may be physiological and does not necessarily require extensive diagnostic investigations.
authors.affiliation: Universitäts-Augenklinik Zürich. hafezi@opht.unizh.ch
authors.forename: F
authors.initials: F
authors.lastname: Hafezi
authors.forename: E
authors.initials: E
authors.lastname: Boltshauser
authors.forename: K
authors.initials: K
authors.lastname: Landau
mesh_terms: D002648:Child; D003937:Diagnosis, Differential; D004569:Electroencephalography; D006801:Humans; D008297:Male; D009460:Neurologic Examination; D011680:Pupil / Q000502:physiology*; D011681:Pupil Disorders / Q000175:diagnosis* / Q000503:physiopathology; D012025:Reflex, Pupillary / Q000502:physiology*; D012075:Remission, Spontaneous