A corneal model system under UV light crosslinking.
Figures are generally photos, graphs and static images that would be represented in traditional pdf publications.
This is epi-off case. (A) The epi-off case with the stroma surface defined as z = 0. (B) The initial (at t = 0) RF concentration distribution inside the stroma given by a distribution function F(z,D), having a diffusion depth (D) [11, 12].