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

doi:10.1016/j.jcrs.2012.04.035

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

Department of Ophthalmology

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	1608-1615
Number of pages	8
Journal	Journal of cataract and refractive surgery
Volume	38
Issue number	9
DOIs	https://doi.org/10.1016/j.jcrs.2012.04.035
Publication status	Published - 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

Access to Document

10.1016/j.jcrs.2012.04.035

Cite this

@article{3ad6fa0a73b6442c84be0f7169205251,

title = "Univariate and bivariate polar value analysis of corneal astigmatism measurements obtained with 6 instruments",

abstract = "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",

author = "Hun Lee and Chung, {Jae Lim} and Kim, {Eung Kweon} and Bradford Sgrignoli and Kim, {Tae Im}",

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 ). ",

year = "2012",

month = sep,

doi = "10.1016/j.jcrs.2012.04.035",

language = "English",

volume = "38",

pages = "1608--1615",

journal = "Journal of cataract and refractive surgery",

issn = "0886-3350",

publisher = "Elsevier Inc.",

number = "9",

}

TY - JOUR

T1 - Univariate and bivariate polar value analysis of corneal astigmatism measurements obtained with 6 instruments

AU - Lee, Hun

AU - Chung, Jae Lim

AU - Kim, Eung Kweon

AU - Sgrignoli, Bradford

AU - Kim, Tae Im

N1 - 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 ).

PY - 2012/9

Y1 - 2012/9

N2 - 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

AB - 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

UR - http://www.scopus.com/inward/record.url?scp=84865206101&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84865206101&partnerID=8YFLogxK

U2 - 10.1016/j.jcrs.2012.04.035

DO - 10.1016/j.jcrs.2012.04.035

M3 - Article

C2 - 22795977

AN - SCOPUS:84865206101

SN - 0886-3350

VL - 38

SP - 1608

EP - 1615

JO - Journal of cataract and refractive surgery

JF - Journal of cataract and refractive surgery

IS - 9

ER -

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

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this