When you shine a light into one pupil, the normal reaction of the other pupil should be to become smaller.
Penlight
The most popular tool for measuring pupil diameter now has a light source and is a penlight. One pupil contracts in reaction to light, whereas the other either doesn't contract at all or contracts more slowly.
Use a penlight to get the maximum amount of pupil contraction in one eye, then quickly move to the other eye and return to the first. A consensual reaction normally causes the second eye to respond with the same pupillary constriction as the first.
Penlight is a useful examination tool for doctors, particularly for small body parts like the mouth, nose, ears, and eyes. They frequently employ it for the pupil test, a physical examination technique used to determine whether pupils contract or remain dilated in response to light.
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