Reflex, Pupillary

**Definition:** Constriction of the pupil in response to light stimulation of the retina. It refers also to any reflex involving the iris, with resultant alteration of the diameter of the pupil. (Cline et al., Dictionary of Visual Science, 4th ed)

**Tree numbers:** - E01.370.376.550.650.690 - E01.370.600.550.650.690 - G11.561.731.705