Have your partner focus on an object on the far side of the room (e. g., the chalkboard or a chart) for 1 minute. Then have your partner switch focus to an object in your hand (e. g., a pencil). Watch your partner's pupils carefully as the point of focus is changed from far to near.

Explanation:

Pupil changes its shape when the eye focuses on near or far object. When we observe something far away, the pupil gets widen. But when we look at something near to us, pupil get smaller. So, pupil adjust itself according to the focus of our eye. If the partner switches from far to near, the pupil changes from wide to small. Pupil changes its shape according to bright as well as dim light also.

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