Bao F, et al. - The goal of this paper was to probe the intraoperator repeatability and interoperator reproducibility of two Scheimpflug-Placido anterior corneal analyzers (Sirius; Costruzione Strumenti Oftalmici, Florence, Italy, and TMS-5; Tomey, Nagoya, Japan) for the measurement of posterior corneal surface, in normal eyes and the agreement between the two devices. High repeatability and reproducibility for posterior corneal surface measurement were illustrated by both Scheimpflug-Placido systems. A high concordance between the two devices was indicative of the interchangeable use in normal eyes.