What Causes Your Pupils in the Eyes to Be Small?

Answer

The pupils in the eyes constrict, or become smaller, for a variety of reasons. These reasons include: a person is confused or overloaded with information, from the effects of certain drugs, and bright light.
Reference:
1 Additional Answer
Eye pupils normally become small due to exposure to bright light. In this kind of light, the pupil contracts because light creates a high impulse causing muscles to close the pupil. The size of the pupil can reflect the body's sate and mind so a small pupil can illustrate anger.
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