Intraocular Pressure Accuracy and Variability of the Barraquer Tonometer

Inclusion Criteria

• •1. All patients of Barnes Retina Institute who are scheduled to undergo vitreoretinal surgery.
• •2. All patients scheduled for routine eye examination at the Washington University Eye Clinic or Barnes Jewish Eye Clinic.
• •3. All ages (patients seen at these locations are adult patients \>18 years of age).