light reflex

Từ điển Oxford Learners Wordfinder Dictionary

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
• Syn:
pupillary reflex, miosis, myosis
• Derivationally related forms:
myotic (for: myosis), miotic (for: miosis)
• Hypernyms:
reflex, reflex response, reflex action, instinctive reflex, innate reflex,
inborn reflex, unconditioned reflex, physiological reaction