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A member asked:

Can you tell me how our brain know to blink at objects heading towards our eyes?

A doctor has provided 1 answer

Optical Reflex: This is the optical reflex. It is a protective reflex that is absent in infants under 9 months old.. it is learned, unlike the corneal, or blink reflex, that causes a blink in response to stimulation of the nasociliary branch of the 5th cranial nerve by irritating the cornea.

Answered 7/21/2017

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