Venus GaugeAn essential surgical tool to accurately and consistently measure patients' vertical dimension of occlusion (VDO). Using the two straight arms of the gauge (A), measure the distance between the center of the eye and where the top lip meets the bottom lip; lock the measurement by tightening the screw. Next, use the other side of the gauge with the curved chin bar by placing gauge between the bottom of nose and the chin (B). As an example, the size