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The article “In Vivo Early Corneal Biomechanical Changes After Corneal Cross-linking in Patients With Progressive Keratoconus” by Vinciguerra et al., which was published in the December 2017 issue of the Journal of Refractive Surgery (volume 33, number 12, pp. 840–846), has been amended to include a factual correction. An error was identified subsequent to its original printing. In Table 1 on page 841, the parameter “Fluence (total) (mJ/cm2)” should read “Fluence (total) (J/cm2)” This error was acknowledged on page 68, volume 34, issue 1. The online article and its erratum are considered the version of record.