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:: Volume 23, Issue 2 (Winter 2018) ::
3 2018, 23(2): 102-107 Back to browse issues page
Repeatability and Similarity of Biometric Measurements by a New Swept-source Optical Coherence (OA 2000) and the Partial Coherence Interferometry Device (IOL Master) as Reference
R. Ghaffari , G. Latifi , H. Ghassemi , M. Zarei Ghanavati
Tehran University of Medical Sciences, Tehran, Iran
Abstract:   (61 Views)
Purpose: To investigate the repeatability and similarity of measurement of Lens thickness (LT), Anterior Chamber Depth (ACD), Axial Length (AL), and keratometry (K) by new OA-2000 device and to compare it with IOL Master 500.
Methods: In this observational cross-sectional study, patients with cataract in one or both eyes were included. Biometery measurements including AL, ACD, LT, and K were obtained by the OA-2000 (software version 1.0R) and IOLMaster 500 (software version 5.4) devices in a random sequence. Two measurements were obtained for each device. Test-retest reliability coefficients for AL, ACD, and K readings was used to show repeatability. The Bland-Altman limits-of-agreement (LoA) method was used to assess the agreement in AL, ACD, and K readings between the 2 biometers.
Results: Fifty-eight eyes (46 right eyes and 12 left eyes) of 58 patients (31 male and 27 female, mean age 61.4 ± 8.3) with cataracts were included in this study. Based on test retest repeatability, coefficient of variation (CV) for different parameters measured by OA2000 showed good to excellent reliability (CV for ACD: 88%, CV for K: 90%, CV for LT: 83%, and CV for AL: 99%). Bland-Altman analysis indicated small mean difference (0.01 for axial length, 0.11 for anterior chamber depth, 0.1 and 0.07 for keratometry) and narrow Limits of Agreement (LoA) for all comparisons (95% LoA: -0.09 -0.1for AL, -0.33 – 0.54 for ACD, -1.8 – 2.1for K1, -0.75 – 0.6 for K2).
Conclusion: The results of this study demonstrated the excellent repeatability of the new swept-source OCT (OA 2000) for measurement of biometric data for IOL power calculation, with good agreement with the standard PCI biometer (IOLMaster 500).
Keywords: Biometery, IOL Master, OA2000
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Type of Study: Research | Subject: Ophthalmology
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Ghaffari R, Latifi G, Ghassemi H, Zarei Ghanavati M. Repeatability and Similarity of Biometric Measurements by a New Swept-source Optical Coherence (OA 2000) and the Partial Coherence Interferometry Device (IOL Master) as Reference. 3. 2018; 23 (2) :102-107
URL: http://binajournal.org/article-1-933-en.html


Volume 23, Issue 2 (Winter 2018) Back to browse issues page
مجله چشم‌پزشکی بینا Bina Journal of Ophthalmology
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