Simultaneous Corneal Topography and Epithelial Thickness Mapping from a Single Measurement Using Optical Coherence Tomography

Figure 5

Cornea with an intracorneal ring segment. OCT reveals epithelial thinning immediately above the ring (blue arrow) with the thickness increasing toward the ring (red arrow). Topography maps reveal abnormalities in the anterior surface of the cornea. The measurements performed with Pentacam have a white background, and the ones performed with REVO NX have a black background. The K1, K2, and astigmatism values for the anterior surface of the cornea obtained using Pentacam are 48.9 D, 52.8 D, and 4.0 D, respectively, while the values obtained using REVO NX are 48.6 D, 52.4 D, and 3.8 D, respectively. The values of analogous parameters for the posterior corneal surface from Pentacam are −9.1 D, −9.5 D, and 0.3 D and the values from REVO NX are −9.1 D, −9.7 D, and 0.6 D.