The role and comparison of EMLA and 4% tetracaine gel in reducing local anesthetic pain in patients undergoing upper blepharoplasty: a randomized, double-blinded, controlled trial

INTERVENTION: blank control group:blank control;30 Minutes Group(GroupA):Two topical anesthetics were applied to the upper eyelids of both eyes of the subjects in random pairs for 30 minutes;60 Minutes Group(Group B):Two topical anesthetics were applied to the upper eyelids of both eyes of the subjects in random pairs for 60 minutes; CONDITION: local anesthetic injection pain of upper blepharoplasty PRIMARY OUTCOME: local anesthetic injection pain of upper eyelids; SECONDARY OUTCOME: local cutaneous reacion;eyelid edema after 24 hours of operation; INCLUSION CRITERIA: Patients undergoing bilateral upper blepharoplasty.