1/6/2023 0 Comments Itrace testing![]() ![]() Moreover, an over- or under-sized ICL may induce unwanted complications, such as IOL rotation or decentration, pigment dispersion, pupillary block glaucoma, and cataract formation. This difference is clinically relevant in determining an accurate lens diameter for implantation of the STAAR Surgical V4 (Version 4) ICL, because this phakic IOL's diameter should be approximately 0.5 to 1.0 mm larger than the WTW distance measurement in myopic eyes. ![]() The results of this study show that the range of the 95 % LoA was approximately 0.5 mm (0.47 mm for all the subjects, 0.46 mm for males and 0.49 mm for females) with the Orbscan II topographer, versus the iTrace aberrometer. Kf (D)Ĕ2.56 ± 1.34Ĕ2.06 ± 1.34Đ.50 mm for the WTW distance was considered as clinically relevant. Table 1 Comparison of the corneal power and WTW distance The Orbscan II topographer generated larger values when compared with those of the iTrace aberrometer for both age 19 years old groups (P 19 years old groups. We evaluated the effects of age on the corneal power and WTW distance measured by the Orbscan II topographer and the iTrace aberrometer. ![]() The Kf, Ks, and WTW distance measurements taken with the Orbscan II topographer were greater in magnitude than those measured by the iTrace aberrometer (P 19 years old groups (19 years or older mean age, 23.00 ± 4.27 n = 60). The corneal power and WTW distance readings assessed with the Orbscan II topographer and the iTrace aberrometer are summarized in Table 1. Results: The mean keratometry values with the Orbscan II and iTrace were 43.16 ± 1.44 and 42.64 ± 1.43 diopter (D), respectively (P 0.1). Statistical evaluation was performed using the paired t test, Pearson correlation, and Bland-Altman analysis for comparison of measurement techniques. Methods: 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. Chen and Xia BMC Ophthalmology (2016) 16:33 DOI 10.1186/s1288-8Ĭomparison of the Orbscan II topographer and the iTrace aberrometer for the measurements of keratometry and corneal diameter in myopic patientsīackground: 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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