Fig. 1.

In vivo confocal microscopy scans of the corneal stroma at 3 years after C-CXL (patient a) and EI-CXL (patient b). In patient a, consecutive scans at different corneal depth: 82, 172, 298, and 309 μm. In patient b, consecutive scans at similar corneal depth: 88, 176, 262, and 263 μm. The transition zone from acellular to cellular corneal stroma was at 298 and 262 μm in patient a and b, respectively