pupillary reflex

/ˌpjupəˈlɛri ˌriˈflɛks/
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Definitions of pupillary 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
    synonyms: light reflex, miosis, myosis
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    type of:
    inborn 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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