Kosekahya P, Koc M, Yalcinsoy KO, et al. - In the present study, the researchers contrasted the central corneal thickness (CCT) measurements measured by using the Pentacam Scheimpflug system with the CCT measured using ultrasound pachymetry (UP) and compared the compatibility between the methods in normal, keratoconic, and cross-linked keratoconic corneas. They involved 50 eyes of 50 patients with keratoconus (keratoconus group), 50 eyes of 50 patients with progressive keratoconus who had corneal cross-linking treatment (CCL group), and 50 eyes of 50 healthy individuals(control group). Findings suggested that Pentacam Scheimpflug tomography and UP may be used interchangeably in normal and mild keratoconic eyes, but not in moderate keratoconic and cross-linked keratoconic eyes. Before planning an invasive procedure in these eyes, Pachymetry measurements from Scheimpflug have to be interpreted with extreme caution with various methods.