Figure 3: Accelerated corneal collagen crosslinking Group 2 (epitheliumoff): Riboflavin 0.1% plus Dextran 20%, 20 min of corneal soaking, UV-A power at 30 mW/cm2, Energy dose at 7.2 J/cm2), 4 min exposure time. Left (a) white arrow: biomicroscopic picture of demarcation line after treatment. Right (b) white arrows: corneal OCT imaging revealing the demarcation line after A-CXL at about 160 μm depth (range 150-180 μm).