Fig. 3From: Effect of the retention ring-assisted continuous application of riboflavin in pulsed-light accelerated corneal collagen cross-linking on the progression of keratoconusChanges of central corneal thickness (μm) (a), thinnest corneal thickness (μm) (b) and endothelial cell density (c) (cells/cm2) following modified pulsed-light accelerated cross-linking at different postoperative periodsBack to article page