Lightwand is a useful alternative device for intubation but scooping movement can induce damage and microbleeding of oral mucosa, postoperative hoarseness,sore throat. Optiscope is rigid video stylet which has camera on distal tip of device. In many previous studies, rigid video stylet has proven advantages compared with other intubating devices.

Inclusion Criteria:

• Patients scheduled for cervical spine surgery under general anesthesia
• aged between 20- 80 yrs

Exclusion Criteria:

• Patient who disagrees to participate this study
• Patient who has history of gastro-esophageal reflux disease, previous airway surgery, an increased risk of aspiration, coagulation disorders
• Patient who has congenital or acquired abnormalities of the upper airway, tumours, polyps, trauma, abscesses, inflammation or foreign bodies in the upper airway