Fig. 9From: Long term results of accelerated 9 mW corneal crosslinking for early progressive keratoconus: the Siena Eye-Cross Study 2Topographic patterns after 9 mW/5.4 J/cm2 ACXL showing preoperative (a) and 5-year postoperative (b) corneal curvature reduction. The differential tangential map (c) shows the typical central flattening (white arrow) and the paracentral steepening (black arrows) surrounding the apex of KCBack to article page