Discriminant Value of Custom Ocular Response Analyzer Waveform Derivatives in Keratoconus – Corrected Proof
Purpose: To evaluate the performance of corneal hysteresis (CH), corneal resistance factor, and 16 investigator-derived Ocular Response Analyzer (ORA) variables in distinguishing keratoconus (KC) from the nondiseased state.Design: Retrospective case series.Participants: Fifty-four eyes of 27 unaffected patients and 49 eyes of 25 KC patients from the Instituto de Olhos, Rio de Janeiro, Brazil.Methods: Sixteen candidate variables were derived from exported ORA signals to characterize putative indicators of biomechanical behavior. Area under the receiver operating characteristic curve (AUC) and the Z statistic were used to compare diagnostic performance.Main Outcome Measures: Discriminant value of standard and derived ORA variables as measured by (Read more...)