Marcus Gunn pupil
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Related to Marcus Gunn pupil: Marcus Gunn phenomenon, Adie's pupil
Mar·cus Gunn pu·pil
(mar'kŭs gŭn), Synonym(s): Gunn pupil
Farlex Partner Medical Dictionary © Farlex 2012
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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
Gunn, Robert Marcus
(gun)Brit. ophthalmologist, 1850–1909.
Gunn dots
White spots occurring on the retina of the eye, close to the macula.
Gunn pupil
, Marcus Gunn pupilDiminished pupillary reaction to direct light; the symptom is secondary to optic nerve disease.
See: swinging flashlight testGunn syndrome
, Marcus Gunn syndromeA congenital condition in which a ptotic eyelid retracts briefly when the mouth is opened or the jaw is moved to one side. The person appears to wink each time the jaw is opened.
See: jaw winkingGunn pupil
, Marcus Gunn pupilDiminished pupillary reaction to direct light; the symptom is secondary to optic nerve disease.
See: swinging flashlight testSee also: Gunn, Robert Marcus
pupil
(pu'pil) [L. pupilla, little doll (the reflection in the pupil)]The contractile opening at the center of the iris of the eye. It is constricted when exposed to strong light and when the focus is on a near object; is dilated in the dark and when the focus is on a distant object. Average diameter is 4 to 5 mm. The pupils should be equal. See: pupilla; illustration
Differential Diagnosis
Constriction of the pupil occurs, for example, in bright light and after exposure to drugs such as morphine, pilocarpine, physostigmine, eserine, and other miotics.
Dilation of the pupil is most often observed after treatment with mydriatic drugs (such as atropine, scopolamine, or homatropine), but may also be caused by paralysis of cranial nerve III, intracranial masses or trauma, sympathetic nervous system stimulation, and other pupillary stimuli.
Adie pupil
See: Adie, William JohnArgyll Robertson pupil
See: Argyll Robertson pupilartificial pupil
A pupil made by iridectomy when the normal pupil is occluded.
bounding pupil
Rapid dilatation of a pupil, alternating with contraction.
Bumke pupil
Dilatation of the pupil owing to psychic stimulus.
cat's-eye pupil
A pupil that is narrow and slitlike.
cornpicker's pupils
Dilated pupils found in agricultural workers who are exposed to dust from jimsonweed. The dust contains stramonium, a mydriatic.
fixed pupil
A pupil that does not react to stimuli.
Gunn pupil
See: Gunn, Robert Marcuskeyhole pupil
A pupil with an artificial coloboma at the pupillary margin.
luetic pupil
Argyll Robertson pupil.Marcus Gunn pupil
See: Gunn, Robert Marcuspinhole pupil
A pupil of minute size; one excessively constricted; seen after use of miotics, in opium poisoning, and in certain brain disorders.
Robertson pupil
See: Argyll Robertson pupilstiff pupil
Argyll Robertson pupil.tonic pupil
Adie pupilMedical Dictionary, © 2009 Farlex and Partners
Gunn,
Robert Marcus, English ophthalmologist, 1850-1909.Gunn dots - minute, highly glistening, white or yellowish specks usually seen in the posterior part of the fundus.
Gunn phenomenon - an increase in the width of the eyelids during chewing. Synonym(s): Gunn syndrome; jaw-winking syndrome; Marcus Gunn syndrome
Gunn pupil - Synonym(s): Marcus Gunn pupil
Gunn sign - compression of the underlying vein at arteriovenous crossings seen ophthalmoscopically in arteriolar sclerosis. Synonym(s): Marcus Gunn sign
Gunn syndrome - Synonym(s): Gunn phenomenon
Marcus Gunn pupil - relative afferent pupillary defect. Synonym(s): Gunn pupil
Marcus Gunn sign - Synonym(s): Gunn sign
Marcus Gunn syndrome - Synonym(s): Gunn phenomenon
Medical Eponyms © Farlex 2012