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Repeatability Of Corneal Topography Measurement In Keratoconus With The Tms-1, Larry Davis, Timothy T. Mcmahon, Robert J. Anderson, Cynthia Roberts, Ashraf M. Mahmoud, Loretta B. Szczotka-Flynn, Thomas W. Raasch, Nina E. Friedman
Repeatability Of Corneal Topography Measurement In Keratoconus With The Tms-1, Larry Davis, Timothy T. Mcmahon, Robert J. Anderson, Cynthia Roberts, Ashraf M. Mahmoud, Loretta B. Szczotka-Flynn, Thomas W. Raasch, Nina E. Friedman
Larry Davis
Purpose. The purpose of this study was to report the test–retest variability of simulated indices derived from the TMS-1 topography instrument (Tomey Technology, Waltham, MA) in keratoconus subjects enrolled in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Methods. Four images were taken at an initial visit and at a repeat visit several weeks later. From these images, 17 indices were simulated from published formulas. Mixed-model analysis was used on test–retest data from the TMS-1 videokeratography instrument during the baseline year. This analysis yields estimates of within- and between-visit variability. Results. Repeatability analysis revealed that within-visit standard errors were 1.0 …