hippus /hip·pus/ (hip´us) abnormal exaggeration of the rhythmic contraction and dilation of the pupil, independent of changes in illumination or in fixation of the eyes.
hippus
hip·pus (h p  s)n. Spasmodic, rhythmical dilation and constriction of the pupil, independent of illumination, convergence, or psychic stimuli. |
hippus
abnormal exaggeration of the rhythmic contraction and dilatation of the pupil, independent of changes in illumination or in fixation of the eyes.
hippus
Small 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.
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.
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