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A member asked:
How do the pupils of your eye change size? what causes this?
A doctor has provided 1 answer
Light reflex: When your eye is exposed to light, the dilated pupils receive a signal from the retina, through your brain which tells them to close down to limit the light entry and protect the eye. The pupils (iris) is a muscular structure in a radial pattern which responds to light signals this way. ;pretty cool!
Answered 3/20/2014
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