AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Itrace topographer9/19/2023 ![]() ![]() ![]() Limits of agreement of 95% showed very little variation among normal adults, indicating that measurements of 0.392 for PSF, 0.547 for MTF, and 3.81 for RMS may be considered "normal" values and useful in comparison with a diseased population to determine contrast sensitivity loss. Using Cronbach’s alpha analysis, we were able to confirm the reliability of the iTrace ray tracing wavefront aberrometer and corneal topographer to measure point spread function, modulation transfer function, and root mean square outputs, which are all indirect measurements of contrast sensitivity. A 95% confidence interval for the mean of the point spread function ranged from 0.3116 to 0.4837 with an average of 0.392, for modulation transfer function 0.47 to 0.572 with an average of 0.547, and for root mean squared 3.43 to 4.00 with an average of 3.81. Refractive status for sphere, cylinder and axis was also analyzed by Cronbach’s alpha analysis and all values were above 0.9 for both the right and left eyes. Methods The right eyes of 100 normal subjects were prospectively scanned 3 times using all the 4 devices. Our primary product focus is on our ray-tracing wavefront and corneal topography combination device, called the iTrace. Purpose To evaluate the repeatability and reproducibility of corneal power measurements obtained by Topcon KR-1W and iTrace, and assess the agreement with measurements obtained by Allegro Topolyzer and IOLMaster. For the first time, eye care practitioners can. Cronbach alpha for point spread function analysis was 0.912 OD and 0.886 OS, modulation transfer function was 0.936 for OD and 0.898 OS, Mean Root Square was. Tracey Technologies 1,162 followers on LinkedIn. With iTrace, users can objectively see what the patient sees with a total quality of vision assessment. Test-retest reliability was confirmed utilizing Cronbach’s alpha analysis. Omphroy also updates your vision prescription so you can wear the most effective. Conclusions: : Using Cronbach’s alpha analysis, we were able to confirm the reliability of the iTrace ray tracing wavefront aberrometer and corneal topographer to measure point spread function, modulation transfer function, and root mean square outputs, which are all indirect measurements of contrast sensitivity. Normal contrast sensitivity was verified utilizing subjective measurement MARS chart at a distance of 40 cm, with mean luminance of 85 cd/m 2. Results with the Orbscan II topographer and the iTrace aberrometer correlated closely, with Pearson correlation coefficients ranging from 0.9426 to 0.9743. iTrace topographer to diagnose corneal pathology. All subjects had BCVA of 20/20 OD and OS and were free of any ocular pathology. ![]() Each measurement was repeated 3 times and testing was conducted uncorrected. Twenty-five visually normal adults (n=50 eyes mean age = 27.56 ± 3.2 years age range 25-39 years), were tested on the iTrace ray tracing wavefront aberrometer and corneal topographer. 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 < 0. To determine whether the iTrace ray tracing wavefront aberrometer and corneal topographer reliably measures contrast sensitivity and refractive error. The corneal power and WTW distance readings assessed with the Orbscan II topographer and the iTrace aberrometer are summarized in Table 1. ![]()
0 Comments
Read More
Leave a Reply. |