Noun: 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
"The ophthalmologist checked the patient's light reflex";
- pupillary reflex, miosis, myosis
Derived forms: light reflexes
Type of: inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex
Encyclopedia: Light reflex