 Vitreoretinal surgery is associated with a considerable incidence of postoperative nausea and vomiting PONV, which is reported to be as high as 60. Reasons for this high incidence may be the long duration of surgery and anesthesia and the high degree of manipulation of the eye. Postoperative vomiting after vitrectomy is an important risk factor for the onset of several complications, such as suprachoroidal hemorrhage, with disastrous visual consequences. 