A corneal model system under UV light crosslinking. LinJui-Teng ChengDa-Chuan 2017 <p>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) [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0175002#pone.0175002.ref011" target="_blank">11</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0175002#pone.0175002.ref012" target="_blank">12</a>].</p>