Figure 7: Accelerated corneal collagen crosslinking Group 4 (epitheliumon): Riboflavin 0.25% plus EDTA, BAK,TRIS for 4 min, Riboflavin 0.25% saline solution for 6 min, UV-A power at 45 mW/cm2 (Energy dose: 7.2 J/ cm2), 2 min. 40 sec exposure time. Left (a) yellow arrow: biomicroscopic picture after epithelium-on accelerated cross-linking showed a slight increased density of sub-Bowman stroma without a visible demarcation line. Right (b) yellow arrows: OCT corneal scans confirmed a slightly increased reflectivity under of corneal stroma under the Bowman’s lamina without evidence of demarcation line.