n. a relflex reaction of the eye in which the eyball retracts in response to the threat of the cornea or the conjunctiva being touched. In lower form of animals, it is the nictitating membrane which closes.
n. a relflex reaction of the eye in which the eyball retracts in response to the threat of the cornea or the conjunctiva being touched. In lower form of animals, it is the nictitating membrane which closes.