What is a hippus pupil reaction?
Hippus is a state of physiologic unrest. The pupil constricts to direct light stimulus but cannot maintain constriction and dilates. Each eye has dual innervation of both sympathetic and parasympathetic systems. The normal resting pupil size is not constant.
What does hippus look like?
Pupillary hippus comes from the Greek hippos meaning horse, perhaps due to the rhythm of the contractions representing a galloping horse. It is particularly noticeable when pupil function is tested with a light, but is independent of eye movements or changes in illumination.
How do you resolve hippus?
Conclusions: 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.
What causes pupillary athetosis?
Pupillary athetosis—or hippus—is bilateral, rhythmic oscillations of the pupil regardless of light intensity. It has been hypothesized that it reflects a dysregulation of central parasympathetic nervous system activity.
What is the meaning of hippus?
Hippus, also known as pupillary athetosis, is spasmodic, rhythmic, but irregular dilating and contracting pupillary movements between the sphincter and dilator muscles. Pupillary hippus comes from the Greek hippos meaning horse, perhaps due to the rhythm of the contractions representing a galloping horse.
Is pupillary hippus normal?
Pupillary hippus (PH) refers to spontaneous bilateral synchronous rhythmic constriction and dilatation of the pupils [1]. This rare phe- nomenon is spasmodic, cyclic and bilaterally in phase, and is usually considered benign [2].
Can you be born with Anisocoria?
Anisocoria can be caused by several things. You can be born with this condition or develop it later. You might experience it on an ongoing basis or only temporarily. In some cases, your doctor might diagnose an underlying medical condition or other cause of anisocoria.
What is Argyll Robertson pupil?
The Argyll Robertson (AR) pupil has been defined as a pupil that is small and constricts poorly to direct light but briskly when a target within reading distance is viewed (“light-near dissociation”).
Is anisocoria serious?
Physiological anisocoria is when there is a natural, small difference in the size of a person’s pupils. This is not harmful and does not require treatment. However, a sudden and pronounced change in one pupil size can indicate a medical condition.
Can anisocoria be cured?
Simple anisocoria This is a benign condition that causes the pupils to differ in size, usually by up to one millimeter in diameter, without affecting the pupils’ response to light. This condition can be intermittent or constant, and may even go away on its own without medical intervention.