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

Figure 6

Postradial keratotomy eye. ETM shows a small paracentral island of increased epithelial thickness (red arrow). Topography maps show an area of reduced curvature of the posterior corneal surface at this location. Also, a flattening of the anterior surface of the cornea can be observed. 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 35.5 D, 37.5 D, and 1.9 D, respectively, while the values obtained using REVO NX are 35.6 D, 37.5 D, and 1.9 D, respectively. The values of analogous parameters for the posterior corneal surface from Pentacam are −4.5 D, −5.0 D, and 0.5 D and the values from the REVO NX are −4.2 D, −5.0 D, and 0.8 D.