Precision and Agreement of Corneal Power Measurements Obtained Using a New Corneal Topographer OphthaTOP

Jinhai Huang, Giacomo Savini, Hao Chen, Fangjun Bao, Yuanguang Li, Haisi Chen, Weicong Lu, Ye Yu and Qinmei Wang

PLOS ONE, 2015, vol. 10, issue 1, 1-15

Abstract: Purpose: To evaluate repeatability and reproducibility of anterior corneal power measurements obtained with a new corneal topographer OphthaTOP (Hummel AG, Germany) and agreement with measurements by a rotating Scheimpflug camera (Pentacam HR, Oculus, Germany) and an automated keratometer (IOLMaster, Carl Zeiss Meditec, Germany). Methods: The right eyes of 79 healthy subjects were prospectively measured three times with all three devices. Another examiner performed three additional scans with the OphthaTOP in the same session. Within one week, the first examiner repeated the measurements using the OphthaTOP. The flat simulated keratometry (Kf), steep K (Ks), mean K (Km), J0, and J45 were noted. Repeatability and reproducibility of measurements were assessed by within-subject standard deviation (Sw), repeatability (2.77 Sw), coefficient of variation (CoV), and intraclass correlation coefficient (ICC). Agreement between devices was assessed using 95% limits of agreement (LoA). Results: Intraobserver repeatability and interobserver and intersession reproducibility of all measured parameters showed a 2.77 Sw of 0.29 diopter or less, a CoV of less than 0.24%, and an ICC of more than 0.906. Statistically significant differences (P

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0109414

DOI: 10.1371/journal.pone.0109414

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