Light Reflex

Noun1.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 smaller
pupillary reflex, miosis, myosis
inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, unconditioned reflex - an automatic instinctive unlearned reaction to a stimulus

 

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