Definition of Light reflex
1. Noun. Reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller.
Generic synonyms: Inborn Reflex, Innate Reflex, Instinctive Reflex, Physiological Reaction, Reflex, Reflex Action, Reflex Response, Unconditioned Reflex
Derivative terms: Miotic, Myotic
Medical Definition of Light reflex
1. A red glow reflected from the fundus of the eye when a light is cast upon the retina, as in retinoscopy. Synonym: eye reflex, fundus reflex, pupillary reflex. Synonym: pyramid of light. (05 Mar 2000)
Light Reflex Pictures
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Lexicographical Neighbors of Light Reflex
Literary usage of Light reflex
Below you will find example usage of this term as found in modern and/or classical literature:
1. Journal of Nervous and Mental Disease by Philadelphia Neurological Society, American Neurological Association, Chicago Neurological Society, New York Neurological Association (1906)
"Dr. Pickett flashes the light and a further contraction of the pupil occurs, which must be a pure light reflex. Some one may say that the pupil being ..."
2. Journal of Nervous and Mental Disease by American Neurological Association, Philadelphia Neurological Society, Chicago Neurological Society, New York Neurological Association, Boston Society of Psychiatry and Neurology (1905)
"The patient still fixing upon this bulb, Dr. Pickett flashes- the light and a further contraction of the pupil occurs, which must be a pure light reflex. ..."
3. The Eye and Nervous System: Their Diagnostic Relations by William Campbell Posey, William Gibson Spiller (1906)
"In cases in which the pupillary light reflex was retained and the knee-jerk ... Cases of loss of pupillary light reflex with intact cord have been reported ..."
4. The Diagnosis of Nervous Diseases by James Purves-Stewart (1906)
"And to explain the occurrence of loss of the light-reflex various theoretical lesions were assumed, sometimes in these Edinger - Westphal nuclei ..."
5. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1902)
"Wernicke's symptom—light reflex preserved when light is thrown on the blind half of an ... In the algid stage of cholera, if the light reflex is present the ..."