light reflex

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light reflex

n.
Contraction of the pupil of the eye in response to an increase in light.
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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 smallerlight 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