Figure 4.

(a) The image in Figure 3a after setting the pixels in each A-scan below some threshold to zero, (b) the image in Figure 4a after setting the pixels in each row below some threshold to zero, (c) the image in Figure 4b after applying median filtering to remove the scattered noise points, and (d) the image in Figure 4c after post-processing to remove outlier points above the corneal apex.