Repeatability of posterior and total corneal curvature measurements with a dual Scheimpflug-Placido tomographer

Journal of Cataract and Refractive Surgery
Eric J KimSumitra S Khandelwal

Abstract

To evaluate the repeatability of the Galilei G4 dual Scheimpflug analyzer in measuring simulated keratometric, total, and posterior corneal curvature in normal and post-refractive surgery eyes. Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA. Prospective evaluation of diagnostic technology. A single observer performed 3 consecutive measurements in 1 eye of each subject. The following were evaluated in both eyes and in eyes that had previous myopic excimer-laser surgery: (1) simulated keratometric corneal power and astigmatism, (2) total corneal power and astigmatism, and (3) posterior corneal power and astigmatism. Repeatability was assessed by calculating the within-subject standard deviation (Sw), coefficient of variation (CoV), and intra-class correlation coefficient (ICC). The study evaluated 41 normal eyes and 36 post-refractive surgery eyes. In normal eyes, the Sw was 0.08 diopters (D), 0.10 D, and 0.03 D for simulated keratometric, total, and posterior corneal power, respectively. The CoV ranged from 0.16% to 0.40%, and the ICC was 0.992 or more (P < .001) for all corneal powers. In post-refractive surgery eyes, the Sw was 0.09 D, 0.09 D, and 0.02 D for simulated keratometric, total, and posterior c...Continue Reading

References

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Jan 1, 2008·Journal of Cataract and Refractive Surgery·Hema ShankarKonrad Pesudovs
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Jan 19, 2011·Journal of Cataract and Refractive Surgery·Giacomo SaviniKenneth J Hoffer
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Aug 16, 2013·Journal of Cataract and Refractive Surgery·Tim de JongNomdo M Jansonius

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Citations

Jan 18, 2017·Expert Review of Medical Devices·Noelia Martínez-AlbertRobert Montés-Micó
Dec 21, 2019·Journal of Cataract and Refractive Surgery·Denise M ViscoMark Packer
Aug 23, 2019·European Journal of Ophthalmology·David P PiñeroMaría Teresa Caballero
Jul 21, 2020·European Journal of Ophthalmology·Pedro Tañá-RiveroRobert Montés-Micó
Jun 8, 2017·International Ophthalmology Clinics·Rodrigo Guimarães de SouzaMitchell P Weikert
Aug 21, 2020·Journal of Cataract and Refractive Surgery·Neal KansaraSeth M Pantanelli

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