Corneal transplantation is usually done under local anesthesia. There are three types of corneal transplantation: 1) corneal penetrating corneal transplantation, 2) corneal lamellar transplantation, and 3) corneal endothelial transplantation. Patients are advised to relax. Patients who are overly nervous are prone to high intraoperative intraocular pressure. To prevent complications such as prolapse of ocular contents, surgery can be done under general anesthesia. Most corneal transplants can be done with retrobulbar anesthesia. Retrobulbar anesthesia is the injection of anesthetic through a long needle behind the eye, which can block the nerve and prevent the eye from turning during the surgery so as to facilitate the surgery. For endothelial transplantation, surface anesthesia is usually sufficient and general anesthesia is usually not required.