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

Figure 3

Ulcerative keratitis with extensive corneal stromal scarring. ETM shows thickening of the epithelium in the area of the disease process (red arrow). Topography maps depict 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 the REVO NX have a black background. The K1, K2, and astigmatism values for the anterior surface of the cornea obtained using Pentacam are 36.8 D, 42.9 D, and 6.1 D, respectively, while the values obtained using REVO NX are 37.6 D, 42.9 D, and 5.3 D, respectively. The values of analogous parameters for the posterior corneal surface from Pentacam are −6.0 D, −6.3 D, and 0.3 D and the values from the REVO NX are −5.8 D, −6.0 D, and 0.2 D.