[Pronounced physiological pupillary hippus]

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.

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.

Even a pronounced hippus may be physiological and does not necessarily require extensive diagnostic investigations.