Comparison of keratometric data of a standard automated keratometer and a Scheimpflug camera in patients with uncomplicated cataracts

Abstract

Purpose. To compare keratometry data based on principles of Gaussian optics and ray tracing method. Material and methods. The study involved 60 patients (60 eyes). Comparative assessment of three groups of keratometric data obtained from optical biometer IOL Master 500 and Axial/Sagital and Total Corneal Refractive Power maps from Pentacam-HR was carried out. Results. When analyzing the obtained indicators, reliably significant results were revealed only when comparing the data of Total Corneal Refractive Power, based on the ray tracing, with classical keratometry IOL Master 500. A comparative assessment of the obtained keratometric data of two Pentacam-HR maps did not show a statistically significant difference, as well as the indicators of classical keratometry Pentacam-HR and IOL Master 500. Conclusion. 1. Evaluation of keratometry data in patients with uncomplicated cataract based on Gaussian optics showed comparable values for the Pentacam-HR and IOL Master 500. There was no significant difference in keratometric values in the comparative analysis of data from Pentacam-HR between classical keratometry and Total Corneal Refractive Power. 2. Total Cornea Refractive Power from Pentacam HR based on ray tracing determined significantly lower values in comparison with the classic keratometry IOL Master 500. Key words: keratometry, corneal refractive power, ray tracing, keratotomography.