Official ESCRS | European Society of Cataract & Refractive Surgeons


Agreement of corneal power measurement with seven different devices

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Session Details

Session Title: Toric IOLs & Lens Power Calculations

Session Date/Time: Sunday 15/09/2019 | 08:00-10:00

Paper Time: 09:08

Venue: Free Paper Forum: Podium 3

First Author: : X.Chen CHINA

Co Author(s): :    Y. Lan   K. Wei   X. Chen   F. Qian                    

Abstract Details


To determine the agreement of corneal power measurements between IOLmaster, Lenstar, Pentacam, iTrace, Verion, Atlas and an auto-refractometer KR-800.


Prospective Study


Totally 88 eyes of 88 health subjects were included in this study. Mean keratometric data, magnitude of astigmatism and astigmatism axis were captured with IOlmaster 500 (Zeiss), Lenstar LS-900 (Haag-Streit), Pentacam HR(Oculus), iTrace(Tracey Technology), Verion(Alcon), Atlas 995 corneal topography(Zeiss), KR-800 auto-refractometer (Topcon). Comparison with IOLmaster, mean keratometric results of other six devices were evaluated by using Bland–Altman plots. Double-angle plots were used to describe the differences in astigmatism assessment.


The mean K of these seven devices was 43.43±1.36D (IOLmaster), 43.63±1.36D (Lenstar), 43.43±1.36D (SimK, Pentacam), 43.44±1.65D (iTrace), 43.97±1.52D (Verion), 43.37±1.37D (Altas) and 43.62±1.44 (KR-800), respectively. For the 95% limits of agreement (LoA) of mean K measurements, there was the narrowest LoA between IOL Master500 and Lenstar900 (from -0.14 to 0.33), while the greatest LoA between IOL Master500 and iTrace (from -1.5 to 2.0). The centroid errors between IOL Master and other devices were 0.09D×78°±0.33D, 0.08D×69°±0.40D, 0.12D×80°±0.36D, 0.09D×13°±0.41D, 0.37D×77°±0.68D, 0.14D×86°±0.39D.


Keratometric and astigmatic result obtained of IOL master500, Lenstar900, Pentacam and Verion showed good consistency

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