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When a boxer gets knocked out in a fight, why do the pupils always roll to the back of their head?

What you are describing is the rolling up of the eyes related to loss of consciousness which is called "Bell's phenomenon.” It is thought to be a protective reflex. Since vision is lost when consciousness is lost, a rolling up of the eyes moves the more sensitive parts under the protection of the upper lid so the eye will maintain its health and vision when consciousness returns.

Answered by: Richard Bensinger, MD Dr. Richard Bensinger

Categories: General Eye Health

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Answered: Aug 06, 2013

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