| 释义 |
DictionarySeepupilMarcus Gunn pupil
Mar·cus Gunn pu·pil (mar'kŭs gŭn), relative afferent pupillary defect. Synonym(s): Gunn pupilMarcus 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.Gunn, Robert Marcus (gun) Brit. ophthalmologist, 1850–1909. Gunn dotsWhite 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 winking
Gunn 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)]  PUPIL DILATIONThe 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; illustrationDifferential DiagnosisConstriction 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 pupilA pupil made by iridectomy when the normal pupil is occluded.bounding pupilRapid dilatation of a pupil, alternating with contraction.Bumke pupilDilatation of the pupil owing to psychic stimulus.cat's-eye pupilA pupil that is narrow and slitlike.cornpicker's pupilsDilated pupils found in agricultural workers who are exposed to dust from jimsonweed. The dust contains stramonium, a mydriatic. fixed pupilA pupil that does not react to stimuli.Gunn pupil See: Gunn, Robert Marcuskeyhole pupilA pupil with an artificial coloboma at the pupillary margin.luetic pupilArgyll Robertson pupil.Marcus Gunn pupil See: Gunn, Robert Marcuspinhole pupilA 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 pupilArgyll Robertson pupil.tonic pupilAdie pupilGunn, 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 syndromeGunn pupil - Synonym(s): Marcus Gunn pupilGunn sign - compression of the underlying vein at arteriovenous crossings seen ophthalmoscopically in arteriolar sclerosis. Synonym(s): Marcus Gunn signGunn syndrome - Synonym(s): Gunn phenomenonMarcus Gunn pupil - relative afferent pupillary defect. Synonym(s): Gunn pupilMarcus Gunn sign - Synonym(s): Gunn signMarcus Gunn syndrome - Synonym(s): Gunn phenomenon |