Comparison of Corneal Tomography: Repeatability, Precision, Misalignment, Mean Elevation, and Mean Pachymetry

Current Eye Research
Simon SchröderAchim Langenbucher

Abstract

To compare corneal tomography and its statistical uncertainty for measurements obtained by three clinically used corneal tomographers: A Scheimpflug camera (Pentacam HR), a swept source optical coherence tomography system (CASIA SS-1000), and Placido ring imaging (TMS-5). Repeated measurements with all three devices on 34 normal eyes were used to estimate the repeatability, precision, and mean values of corneal elevation and pachymetry within 8 mm diameter. The repeatability (standard deviation) was calculated for each data point of the corneal elevation data-maps of anterior and posterior cornea as well as for the pachymetry data-maps. Uncertainty on the position of the eye at each measurement might contribute to the differences between elevation data-maps. To take this into account, we defined the precision as the standard deviation for the elevation data-maps of anterior and posterior cornea after correction of misalignment-effects (rotation, translation). The mean elevation and pachymetry data-maps were fitted with Zernike polynomials for interdevice-comparison. Pentacam HR offered the best repeatability and precision for the anterior corneal elevation (<3 and <1.6 μm, respectively). CASIA SS-1000 offered good repeatability...Continue Reading

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Citations

Feb 23, 2019·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Harry Yip, Elsie Chan
Feb 13, 2020·Journal of Cataract and Refractive Surgery·Colm McAlindenKonrad Pesudovs
Mar 7, 2020·Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·C MatarT Eppig
Jul 18, 2020·Eye·Xuemin ZhangWuqaas M Munir
Nov 30, 2018·Current Eye Research·Pinar KosekahyaYasin Sakir Goker
Jul 24, 2020·Eye & Contact Lens·Joan Pérez-CorralMireia García
Jul 25, 2021·Scientific Reports·Ruriko TakakuTetsuro Oshika

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