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Yue Liu, Debora Lee, Pauline Kang, Christine Wildsoet; Accuracy and repeatability of measurements from the Topcon KR1W Aberrometer compared to other clinical instruments. Invest. Ophthalmol. Vis. Sci. 2014;55(13):2122.
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To verify the accuracy and repeatability of the Topcon KR1W aberrometer in normal eyes, as well in eyes that have undergone cataract or corneal refractive surgery, or orthokeratology (ortho-K) treatment.
The accuracy and repeatability of measurements of refractions, wavefront aberrations, and corneal topography taken with a Topcon KR1W were compared to the results from Grand Seiko autorefractor, COAS aberrometer, and Medmont E300 corneal topography respectively. Subjects were not cyclopleged. Fifty normal eyes of 25 young subjects with refractive errors ranging from -12 to +6 D, 20 pseudophakic eyes of 12 elderly subjects, 6 eyes of 3 LASIK surgery subjects, and 10 eyes of 5 (ortho-K) subjects were included in the study. For aberration measurements, several Zernike coefficients of high clinical relevance (Z2,0, Z2,2, Z2, -2, Z3,1, Z3,-1, and Z4,0) were compared. Results from autorefraction measurements were compared with the mean spherical equivalent (MSE), J0, and J45 components. For corneal topography, mean central radius and asphericity (e value) were compared.
Overall, there was no significant differences between the equivalent data captured from the above instruments. Aberrometry data were able to be collected from all but two pseudophakic eyes, due to post-surgery opacification and/or small pupil sizes, and in these cases, both Topcon KR1W and COAS failed.
The refraction, aberration and corneal topography data collected with the Topcon KR1W aberrometer were comparable to data collected with 3 independent instruments, for both normal eyes with a wide range of refractive errors as well as pseudophakic eyes, and eyes treated with LASIK or ortho-K. The Topcon KR1W has the practical advantage in that all these data can be collected simultaneously.
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