Hello. You forgot to put the image that this question refers to. The image is attached.
Answer:
pupil constriction
Explanation:
The nerve shown in the image is responsible for the constriction of the pupil, which is officially called as Miosis, which is the opposite of dilation of the pupil which can also be called midriase. Miosis causes bison problems and is an uncommon medical condition, but it causes a lot of discomfort and can even be caused by various drugs and medications.