Figure 5: Accelerated corneal collagen crosslinking Group 3 (epithelium-off): Riboflavin 0.1% (dextran free) plus HPMC, 10 minutes of corneal soaking, UV-A power at 30 mW/cm2 (Energy dose: 7.2 J/cm2), 4 min exposure time. Left (a) light blue arrow: biomicroscopic picture of demarcation line after treatment. Right (b) light blue arrows: corneal OCT imaging revealing the demarcation line after A-CXL at about 150 μm depth (range 140-180 μm).