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Agreement between Pentacam and handheld Auto-Refractor/Keratometer for keratometry measurement.

Authors :
Hashemi H
Heydarian S
Ali Yekta A
Aghamirsalim M
Ahmadi-Pishkuhi M
Valadkhan M
Ostadimoghaddam H
Amiri AA
Khabazkhoob M
Source :
Journal of optometry [J Optom] 2019 Oct - Dec; Vol. 12 (4), pp. 232-239. Date of Electronic Publication: 2019 Jul 10.
Publication Year :
2019

Abstract

Objective: This study was conducted to evaluate the level of agreement in keratometry measurements between a rotating Scheimpflug imaging-based system (Pentacam) and a handheld auto-refractokeratometer (handheld NIDEK ARK-30).<br />Method: This analytical cross-sectional study was conducted in the right eyes of 579 subjects. Keratometry measurements were conducted with the Pentacam and the handheld NIDEK ARK-30 systems. The SPSS Software version 22 and MedCalc V3 were applied to estimate descriptive statistics using paired t-test, Pearson correlation coefficient, 95% limits of agreement (LoA), and Bland-Altman plot.<br />Results: In the total sample, the inter-device difference in the mean flat and steep keratometry values was -0.266 diopter (D) (P-value<0.001) and 0.052D (P-value=0.093), respectively. There was a significant difference in mean flat keratometry between the two devices in all groups of refractive errors (paired difference <0.5D and P-value<0.001). The difference in mean steep keratometry was significant only in myopic subjects (P-value=0.046). The 95% LoA between the two devices measurements was 2.51D, 3.98D, and 6.37D for flat keratometry and 2.6D, 3.2D, and 3.9D for steep keratometry in emmetropic, myopic, and hyperopic subjects, respectively.<br />Conclusion: Our study showed relatively wide limits of agreement between handheld NIDEK ARK-30 and Pentacam; therefore, these devices cannot be used interchangeably for measuring corneal curvature.<br /> (Copyright © 2019 Spanish General Council of Optometry. Published by Elsevier España, S.L.U. All rights reserved.)

Details

Language :
English
ISSN :
1989-1342
Volume :
12
Issue :
4
Database :
MEDLINE
Journal :
Journal of optometry
Publication Type :
Academic Journal
Accession number :
31300242
Full Text :
https://doi.org/10.1016/j.optom.2019.06.001