Comparison of dual rotating Scheimpflug-Placido, swept-source optical coherence tomography, and Placido-scanning-slit systems

Purpose To compare measurements of corneal indices using dual rotating Scheimpflug–Placido, swept-source optical coherence tomography (OCT), and Placido–scanning-slit systems. Setting Kangbuk Samsung Hospital, Seoul, South Korea. Design Prospective evaluation of diagnostic tests. Methods Corneal topography measurements were performed using dual rotating Scheimpflug–Placido (Galilei G2), swept-source OCT (Casia SS-1000), and Placido–scanning-slit (Orbscan IIz) systems. The intraclass correlation coefficients (ICCs) and Bland-Altman plots were used to evaluate the agreement between measurements. Results Fifty post-refractive surgery eyes and 50 normal eyes were evaluated. The agreement in anterior keratometry and pachymetry between the 3 devices was high in both groups ...