Patient-preferred Aromatherapy Versus Placebo For Reducing Preoperative Anxiety In Patients Undergoing Eye Surgery

Inclusion Criteria: * mental capacity for informed consent * undergoing elective ambulatory eye surgery (including Phacoemulsification, Femtosecond laser-assisted cataract surgery (FLACS), Extracapsular cataract extraction (ECCE) and vitrectomy). * surgery only under Monitored Anaesthesia Care (MAC)3 * surgical duration less than 45 minutes Exclusion Criteria: * anosmia * allergy to aromatherapy oil * asthma * allergic rhinitis * psychiatric disease * altered mental state * lack of mental capacity * active infection * pregnancy * patient or surgeon refused participation