Variation in the best fit sphere radius of curvature as a test to detect keratoconus progression on a scheimpflug-based corneal tomographer

Abstract

PURPOSE: To evaluate the variation in the best fit sphere radius (BFSR) of curvature on a Scheimpflug corneal tomographer as a test to detect keratoconus progression. METHODS: In this retrospective, comparative, case-control study, two groups of eyes with stable or progressive keratoconus were identified based on keratomet-ric, refractive, and visual acuity criteria. Two sequential scans were used to assess the variation in topometric variables. Receiver operating characteristic analysis was conducted for anterior and posterior BFSR values. RESULTS: A total of 94 eyes of 62 patients were included in the study; 43 eyes were included in the progressive group and 51 eyes in the stable group. In..