Marcus Gunn phenomenon


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jaw-·wink·ing syn·drome

[MIM*154600]
an increase in the width of the palpebral fissures during chewing, sometimes with a rhythmic elevation of the upper lid when the mouth is open and with ptosis when the mouth is closed.

Marcus Gunn pupil

A change in the pupillary reflex, caused by unilateral optic nerve or retinal disease.

Method
A light is shone, first on one eye and then the other, with the opposite eye covered; the affected eye demonstrates a slight contraction or dilation of the pupil.

Marcus Gunn phenomenon

Marcus Gunn pupillary sign, swinging flashlight Neurology A change in the pupillary reflex, caused by unilateral optic nerve or retinal disease; a light is shined, first on one, then the other eye with the opposite eye covered; the affected eye demonstrates a slight contraction or dilation of the pupil

jaw-wink·ing syn·drome

(jaw'wingk'ing sin'drōm)
An increase in the width of the palpebral fissures during chewing, sometimes with a rhythmic elevation of the upper lid when the mouth is open and ptosis when the mouth is closed.
Synonym(s): Gunn syndrome, Marcus Gunn phenomenon, Marcus Gunn syndrome.

Marcus Gunn phenomenon

See JAW WINKING.
References in periodicals archive ?
com), the world's first complete online lifestyle management site, today announced it has awarded a sweepstakes prize of $10,000 to the administrator of a group of MyEvents users consisting of 32 people afflicted with the rare Marcus Gunn Phenomenon.
Usually present at birth, Marcus Gunn Phenomenon is a rare genetic disorder characterized by the rapid rising motion of the upper eyelid of one eye upon movement of the jaw.