The "direct reaction" or "direct pupillary response" is when the pupil of one eye constricts when light is shined into that same eye.
The "consensual reaction" or "consensual pupillary response" is when the pupil of the other eye also constricts when light is shined into one eye. For example in a normal individual, if light is shined into only the right eye, then the pupil of the left eye will also constrict with the same magnitude as the pupillary constriction of the right eye.
An individual's pupils will also constrict when the eyes change fixation from distance to near. This reaction is part of the "near response." The 3 components of the "near response" are: (1) convergence (i.e. eyes turning inward together); (2) pupillary constriction; and (3) accommodation (i.e. changing lens shape to bring the near target into focus).
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