Double eyelid surgery is usually performed using local infiltration anesthesia with a concentration of 2% lidocaine, as the procedure requires the patient to cooperate with the doctor to do some eye opening and closing movements, in order to ultimately achieve the best aesthetic shape. The pain caused by anesthesia is no different from the usual injection, only the moment of injection and a few seconds after the time of pain, less than a second anesthesia will take effect. However, from the point of view of pain medicine, everyone’s pain tolerance is different, so the degree of pain will also vary from person to person. In addition, whether or not the pushing process hurts depends on whether or not the aesthetician herself is tense. If the injection the more nervous, the more muscle contraction, the doctor will gently push the anesthetic, anesthetic slowly infiltrate the general pain. The effect of anesthetic generally lasts for 2-4 hours, ordinary double eyelid surgery generally will not exceed this time, as long as the doctor injects the location accurately, there is no need to worry about pain during the operation, and the anesthetic can be replenished at any time. If in the late stage of the operation, because of the double eyelid shape adjustment, the requirement needs to extend the operation time a little bit, and feel the pain is unbearable, you can also explain to the surgeon, then you can add a little bit of anesthesia, which will not affect the operation.