For the measurement of WTW distance, the range of the 95 % LoA between the two devices was 0.47 mm.įor some clinical applications, the keratometry and WTW distance measurements obtained by the Orbscan II topographer and the iTrace aberrometer differed greatly and therefore were not interchangeable.Ĭlinical trials number: ChiCTR-OCS-14005077 (August 2nd, 2014). This iTrace system provides auto-refraction, corneal topography, ray tracing aberrometry, pupillometry and auto-keratometry.
For the measurement of corneal power, the 95 % limits of agreement (LoA) between the Orbscan II and iTrace were - 0.21 to 1.21 D for the flat meridian and - 0.15 to 1.25 D for the steep meridian. We report a patient with bilateral IOL subluxation that was followed with images captured with the iTrace aberrometer/topographer (Tracey Tech, Houston. The mean WTW distance measurements with the Orbscan II and iTrace were 11.57 ± 0.34 and 11.33 ± 0.36 mm, respectively (P < 0.0001). The mean keratometry values with the Orbscan II and iTrace were 43.16 ± 1.44 and 42.64 ± 1.43 diopter (D), respectively (P < 0.0001). 7 iTrace is a Ray Tracing aberrometer that employs both wavefront (WF) aberrometry and Placido corneal topography (CT). Statistical evaluation was performed using the paired t test, Pearson correlation, and Bland-Altman analysis for comparison of measurement techniques. Tracey itrace technology enables the trace users o objectively see what the patients see with a total quality visual assessment. Finally, the iTrace topographer not only provides a traditional 3-mm simulated keratometry (SimK) reading but also maps the refractive keratometry (K). (PDF) Comparison of the Orbscan II topographer and the iTrace aberrometer for the measurements of keratometry and corneal diameter in myopic patients Comparison of the Orbscan II topographer. Keratometry readings in the flat (Kf) and steep (Ks) meridians and WTW distance were measured with the Orbscan II and iTrace systems in 100 myopic patients. corneal topography and higher-order aberrations performed by a Scheimpflug Sirius corneal tomographer and its comparison with the Tracey itrace. Tracey iTrace Combines autorefraction, corneal topography, auto-keratometry, wavefront aberrometry, and pupillometry in one system. The purpose of this study was to compare corneal power and horizontal corneal diameter (white-to-white distance) readings obtained by the Orbscan II topographer and the iTrace aberrometer.
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