light reflex
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light reflex
n.
Contraction of the pupil of the eye in response to an increase in light.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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| Noun | 1. |  light reflex - reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smallerinborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex - an automatic instinctive unlearned reaction to a stimulus |
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