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

Hashemi, H. and Heydarian, S. and Ali Yekta, A. and Aghamirsalim, M. and Ahmadi-Pishkuhi, M. and Valadkhan, M. and Ostadimoghaddam, H. and Amiri, A. A. and Khabazkhoob, M. (2019) Agreement between Pentacam and handheld Auto-Refractor/Keratometer for keratometry measurement. Journal of Optometry, 12 (4). pp. 232-239.

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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). 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. 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 0.052 D (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 <0.5 D 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 2.51 D, 3.98 D, and 6.37 D for flat keratometry and 2.6 D, 3.2 D, and 3.9 D for steep keratometry in emmetropic, myopic, and hyperopic subjects, respectively. 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. © 2019 Spanish General Council of Optometry

Item Type: Article
Additional Information: Export Date: 16 February 2020 Correspondence Address: Khabazkhoob, M.; Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical SciencesIran; email:
Uncontrolled Keywords: Handheld auto-refractokeratometer Keratometery Pentacam
Subjects: WW Ophthalmology
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib1 lib1
Date Deposited: 21 Jun 2020 06:38
Last Modified: 21 Jun 2020 06:38

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