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hippus
hippus (ˈhɪpəs) n (Medicine) ophthalmol a disorder of the eye in which the pupil dilates and contracts in an irregular spasmodic rhythmhippus
hippus [hip´us] abnormal exaggeration of the rhythmic contraction and dilation of the pupil, independent of changes in illumination or in fixation of the eyes.hip·pus (hip'ŭs), Intermittent pupillary dilation and constriction, independent of illumination, convergence, or psychic stimuli. [G. hippos, horse, from a fancied suggestion of galloping movements] hippus A spasm of the iris, resulting in exaggerated rhythmic contractions and dilatations of the pupil that are not consonant with accommodation and light. See Hiccup. hip·pus (hip'ŭs) Intermittent pupillary dilation and constriction, independent of illumination, convergence, or psychic stimuli. [G. hippos, horse, from a fancied suggestion of galloping movements]hippusSmall rhythmic variations in the size of the pupils. They are present in everybody and increase slightly at high luminances. The frequency of these oscillations is about 1.4 Hz. Hippus may also be associated with systemic disorders such as multiple sclerosis, neurosyphilis and myasthenia gravis. |