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

Figure 2

Postpterygium surgery OCT tomogram shows an irregular reduction in the epithelial thickness across the entire upper and partially nasal portions of the central cornea on the ETM (blue arrows). Topography maps reveal irregular astigmatism of the anterior surface of the cornea while the posterior surface is regular. 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 41.2 D, 44.8 D, and 3.6 D, respectively, while the values obtained using REVO NX are 41.4 D, 44.5 D, and 3.1 D, respectively. The values of analogous parameters for the posterior corneal surface from Pentacam are −6.5 D, −6.6 D, and 0.1 D and the values from REVO NX are −6.2 D −6.5 D 0.3 D.