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

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

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

Suggested Citation

  • Jinhai Huang & Giacomo Savini & Hao Chen & Fangjun Bao & Yuanguang Li & Haisi Chen & Weicong Lu & Ye Yu & Qinmei Wang, 2015. "Precision and Agreement of Corneal Power Measurements Obtained Using a New Corneal Topographer OphthaTOP," PLOS ONE, Public Library of Science, vol. 10(1), pages 1-15, January.
    • Handle: RePEc:plo:pone00:0109414
    DOI: 10.1371/journal.pone.0109414
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    References listed on IDEAS

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    1. Qinmei Wang & Giacomo Savini & Kenneth J Hoffer & Zhen Xu & Yifan Feng & Daizong Wen & Yanjun Hua & Feng Yang & Chao Pan & Jinhai Huang, 2012. "A Comprehensive Assessment of the Precision and Agreement of Anterior Corneal Power Measurements Obtained Using 8 Different Devices," PLOS ONE, Public Library of Science, vol. 7(9), pages 1-8, September.
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