Saglik A, et al. - In this prospective study, the researchers compared the accuracy of the anterior corneal simulated keratometry (SimK) and the Holladay equivalent keratometry reading (EKR) provided by a Scheimpflug camera (Pentacam HR) with the keratometry (K) provided by a Placido system (T-Cone topography) in keratoconus and control eyes. Study participants were 40 consecutive subjects with keratoconus and 40 voluntary participants with no ocular complaints. Data reported that in diseases which affect the posterior corneal surface, such as keratoconus, it was thought that because of the asymmetrical peripheral placement of the corneal apex, as the corneal diameter increases there could be an error increase of 1–3 mm in keratometric systems evaluating the anterior surface.