Postoperative Painful Eye

A 50-yr-old female, American Society of Anesthesiologists physical status 1, is scheduled for laparoscopic cholecystectomy. Her history is noncontributory. She takes no medication and has no allergies. The patient is otherwise healthy and has no complaints. She has removed her glasses and states that she does not use any contact lenses. You are joined by a medical student who put all the monitors on the patient, including the oxygen saturation monitor on her right index finger. The patient is induced, and the medical student ventilates the patient by mask. He places an endotracheal tube in the trachea successfully. The anesthetic proceeds uneventfully and she wakes up pain free and is taken to the recovery room in a stable condition. About 1 h later, the patient is still in the recovery room. You are called by the recovery room nurse to tell you that the patient is complaining of a painful eye. What will you do and what could the cause be?