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

Figure 4

Cornea with keratoconus. The decrease in corneal epithelial thickness (blue arrow) corresponds to the increase in corneal thickness on the pachymetry map. Topography maps show that both the anterior and posterior corneal surfaces have irregular curvature. The measurements performed with Pentacam have a white background, and the ones performed with the REVO NX have a black background. The K1, K2, and astigmatism values for the anterior surface of the cornea obtained using Pentacam are 51.0 D, 62.9 D, and 11.9 D, respectively, while the values obtained using the REVO NX are 50.9 D, 61.9 D, and 11.0 D, respectively. The values of analogous parameters for the posterior corneal surface from Pentacam are −7.7 D, −9.7 D, and 2.0 D and the values from REVO NX are −7.2 D, −9.4 D, and 2.2 D.