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How to test Pupils with Penlight
Slightly darken the room. Then test the pupils for direct response (reaction of the pupil you're testing) and consensual response (reaction of the opposite pupil) by holding a penlight about 20" (51 cm) from patient's eyes, directing the light at the eye from the side.Next, test accommodation by placing your finger about 4" (10 cm) from the bridge of the patient's nose. Ask him to look at your finger. His eyes should converge and his pupils should constrict.
grading the pupil size chart