Hippus - Wikipedia
Pupillary hippus, also known as pupillary athetosis, is spasmodic, rhythmic, but regular dilating and contracting pupillary movements between the sphincter and dilator muscles. [1] [2] Pupillary hippus comes from the Greek hippos meaning horse, perhaps due to the rhythm of the contractions representing a galloping horse. [3]
“The Pupillary (Hippus) Nystagmus”: A Possible Clinical Hallmark …
The semantic expression ‘pupillary nystagmus’ is intended only as a current, but suggestive, variant with the aim of referring to the common traits that the phenomenon of pupillary hippus has with extravestibular nystagmus.
Pupillary hippus as clinical manifestation of refractory autonomic ...
2018年9月23日 · Pupillary hippus (PH) refers to spontaneous bilateral synchronous rhythmic constriction and dilatation of the pupils [1]. This rare phenomenon is spasmodic, cyclic and bilaterally in phase, and is usually considered benign [2].
Neuro-ophthalmology Illustrated Chapter 12 – The Pupil 1
2019年10月10日 · Hippus is the normal rhythmic pupillary oscillation commonly seen when light stimulates either eye. Both pupils oscillate in synchrony, and the amplitude and frequency vary ( Table 12.2). Changes in the pupil innervation will produce dilation or constriction of the pupil.
Origins of Pupillary Hippus in the Autonomic Nervous System
In this study we aimed to determine the roles of the SNS and PNS in pupillary hippus by pharmacologic means. Participants received either a PNS antagonist (tropicamide) or a SNS agonist (phenylephrine) to dilate their pupil.
Pupillometry: Psychology, Physiology, and Function - PMC
Taken together, spontaneous fluctuations in pupil size, often called pupillary unrest or hippus, seem to reflect fluctuations in level of arousal, and are especially pronounced when someone is tired (Lowenstein et al., 1963) and not engaged in a specific task (Bouma & Baghuis, 1971).
What is Hippus? Rhythmic constriction and dilation of the pupil. Can be easily observed when light is shined on eyes Hippus is however independent of light Often likened to a person dancing or a horse galloping Rhythmic Physiological or Pathological: Physiological but can be both
Neuromodulatory Correlates of Pupil Dilation - PMC - PubMed …
The pupil can also undergo periods of spontaneous, oscillating constrictions, and dilations that occur independently of changes in illumination or of eye movements. These changes are termed pupillary “hippus” and are thought to result primarily from parasympathetic nervous system activity (Turnbull et al., 2017).
Human Pupil Reflexes - Clinical Neuro-Optic Reseach Institute
These spontaneous and pronounced oscillations are known as “hippus.” The amplitude of these oscillations decreases in bright light and is at its largest when the pupil is of average size and the iris has maximum freedom of movement.
Origins of Pupillary Hippus in the Autonomic Nervous System
2017年1月1日 · Pupillary hippus can be extinguished by antagonizing the PNS, whereas agonizing the SNS dilates the pupil without affecting hippus. This suggests that hippus originates from central PNS activity, and not from SNS activity, or oscillations in the balance between PNS and SNS at the pupil.
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