 Methods: A randomized controlled trial. Healthy volunteers will be randomly allocated to three groups: Acupuncture group - will be submitted to a 20-minute session of acupuncture with needles inserted in specific points Tong Zi Liao, Yang Bai and Jing Ming; Sham group - will be submitted to a 20- minute session of acupuncture with needles inserted in false points located 1 cm from true points in areas without acupunctures meridians; and Control group - no intervention. IOP measurement by a masked investigator using Goldmann applanation tonometry immediately before the intervention, as well as 30 minutes and 24 hours after the acupuncture. 