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The article “Corneal Cross-Linking (CXL): Standardizing Terminology and Protocol Nomenclature” by Randleman et al., which was published in the November 2017 issue of the Journal of Refractive Surgery (volume 33, number 11, pp. 727–729), has been amended to include a factual correction. An error was identified subsequent to its original printing. On page 728, the sentence “Wollensak et al.1 first reported their protocol in 2003, using 3 mW fluence for 30 minutes to achieve a total irradiance of 5.4 mJ/cm2.” should read “Wollensak et al.1 first reported their protocol in 2003, using 3 mW fluence for 30 minutes to achieve a total irradiance of 5.4 J/cm2.” In Table 1, 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.