The higher variability should be taken into account before performing any treatment.Ĭopyright 2016, SLACK Incorporated. Caution should be taken when interpreting the topographies of such patients. Threshold values of keratometric changes used to ascertain keratoconus progression should be carefully considered. Topographies performed in keratoconic eyes are less repeatable than those performed in normal eyes. Wavefront Aberrometry is the dynamic measurement of the focusing power of the human eye, and the Tracey iTrace measures this by inputting parallel light. For the maximum keratometry measurement, repeatability limit was 1.73, 1.49, and 1.41 diopters (D) in the stage I-IV keratoconic eyes group, 1.11, 1.02, and 0.98 D in the stage I-II keratoconic eyes group, and 0.61, 0.37, and 1.02 D in the normal eyes group with Orbscan II, OPD-Scan III, and iTrace, respectively. For almost all parameters studied, the repeatability limit was higher in the two groups of keratoconic eyes compared to normal eyes with all three topographers, indicating lower repeatability. Three groups were evaluated: all stage I-IV keratoconic eyes (59 eyes), a subgroup consisting of stage I-II keratoconic eyes (41 eyes), and normal eyes (54 eyes). Repeatability limit and intraclass correlation coefficients (ICCs) of keratometric readings were calculated.įifty-nine keratoconic eyes of 34 patients and 54 normal eyes of 27 patients were included. Measurements were performed with a combined Placido-scanning slit system (Orbscan II) and two combined Placido-aberrometer systems (OPD-Scan III and iTrace).
Bioz Stars score: 86/100, based on 1 PubMed citations. In this prospective cohort study, patients were recruited between November 2011 and May 2012. Itrace Aberrometer Topographer, supplied by Tracey Technologies, used in various techniques. To assess the repeatability of the corneal topography functions of Orbscan II (Bausch & Lomb, Rochester, NY), OPD-Scan III (Nidek, Gamagori, Japan), and iTrace (Tracey Technologies, Houston, TX) in keratoconic eyes and in a control group of normal patients.
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