Bilateral Circumscribed Posterior Keratoconus: Visualization by Ultrasound Biomicroscopy and Slit-Scanning Topography Analysis

Figure 6

Slit-scanning topography analysis of the posterior corneal curvature (Orbscan) shows the circumscribed protrusion of the posterior surface, located paracentrally inferiorly. The color code indicates a “bulging” of about 75 μm.