hippus

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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

/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

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]

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

abnormal exaggeration of the rhythmic contraction and dilatation of the pupil, independent of changes in illumination or in fixation of the eyes.