The words tijera and tijeras can be used interchangeably in Spanish to refer to a single pair of scissors.
Both IV sedation (twilight) and general anesthesia are used commonly for cosmetic or plastic surgery. Regardless of technique, the patient's vital signs must be monitored, which include but not limited to heart rate, blood pressure, and breathing rate.
In general sedation will not require a breathing tube and is fairly easy to rebound from. General anesthesia is what is thought about for most surgeries. In this type of anesthesia, the patient is completely asleep, requires a breathing tube and can take a day or two to recover. Eyelid surgery can be done with any of the three types of anesthesia. Upper eyelid surgery is probably most commonly done using local anesthesia though there are circumstances where sedation or even general is necessary. Lower eyelid surgery is a bit more complicated.