1 Department of Anaesthesia, Harvard Medical School, Massachusetts General Hospital, Department of Anesthesia, Critical Care and Pain Medicine, Boston, Massachusetts, knanji@partners.org Betsy Lehman Center for Patient Safety, Boston, Massachusetts Ophthalmic Consultants of Boston, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts Department of Anesthesia, Massachusetts Eye & Ear, Harvard Medical School, Boston, Massachusetts.