Univariate and bivariate polar value analysis of corneal astigmatism measurements obtained with 6 instruments

Hun Lee, Jae Lim Chung, Eung Kweon Kim, Bradford Sgrignoli, Tae Im Kim

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37 Citations (Scopus)


Purpose: To compare the corneal astigmatism measurements from 6 instruments in preoperative assessment for toric intraocular lens (IOL) implantation. Setting: Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea. Design: Prospective comparative observational study. Methods: This study included patients with cataract and more than 1.00 diopter (D) of corneal astigmatism. For preoperative evaluation of toric IOL implantation, the net astigmatism was evaluated using manual keratometry, autokeratometry, partial coherence interferometry (PCI) (IOLMaster), corneal topography/ray-tracing aberrometry (iTrace), scanning-slit topography (Orbscan), and Scheimpflug imaging (Pentacam). All net astigmatisms were converted to polar values. Using the astigmatism measurements from manual keratometry as a standard, Bland-Altman analysis, linear mixed-model, and bivariate graphic analysis were performed. Results: The study group comprised 257 eyes of 141 patients. Bland-Altman plots showed good agreement between manual keratometry and each instrument for polar values. There was no significant between-instrument difference in KP(90) and KP(135) in the linear mixed model analysis or in bivariate polar values in bivariate confidence ellipses. Conclusion: The corneal astigmatism measurements from autokeratometry, PCI, corneal topography/ray-tracing aberrometry, scanning-slit topography, and Scheimpflug imaging were comparable to those from manual keratometry and can be used interchangeably with manual keratometry to measure corneal astigmatism. Financial Disclosure: No author has a financial or proprietary interest in any material or method Mentioned

Original languageEnglish
Pages (from-to)1608-1615
Number of pages8
JournalJournal of cataract and refractive surgery
Issue number9
Publication statusPublished - 2012 Sept

Bibliographical note

Funding Information:
Supported in part by grant MEST ( 2009-00753330 from the National Research Foundation of Korea and by a grant from KRIBB Research Initiative Program and the Converging Research Center Program funded by the Ministry of Education, Science and Technology ( 2011K000680 ).

All Science Journal Classification (ASJC) codes

  • Surgery
  • Ophthalmology
  • Sensory Systems


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