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- Title
COMPARISON OF BIOMETRIC PARAMETERS AND THE LEVEL OF AGREEMENT BETWEEN OB820 AND IOL MASTER.
- Authors
Khan, Fatima; Humayun, Sadia; Basit, Imran; Akbar, Bushra; Younis, Fazla; Ishaq, Mazhar
- Abstract
Objective: Compare the axial length and other biometric parameters by two biometric devices. Compare their level of agreement for these parameters. Study Design: Cross-sectional study. Place and Duration of Study: Armed Forces Institute of Ophthalmology, from Jul 2016 to Apr 2018. Methodology: Study was carried out in Armed forced institute of ophthalmology on 70 eyes of 53 patients with Nucleus sclerosis grade II, III cataract. Patients under went ophthalmic and biometric examination using optical biometery devices IOL-Master (Carl Zeiss) and OB-820 (Wave Light, Germany). Parameters included axial length, keratometric indices and anterior chamber depth. Results were evaluated using Bland Altman analyses for level of agreement, while differences were assessed using the paired samples t test, and correlation was evaluated by interclass correlation coefficient. Results: Mean axial length assessed by OB 820 and IOL Master differed significantly in two groups (23.16 ± 1.25 vs 23.53 ± 1.34), with a p-value of 0.018. Bland-Altman analysis confirmed significant difference among ranges and 95% limits of agreement for Axial Length with interclass correlation of 0.659. While for other parameters including Keratometery 1,2 and anterior chamber depth excellent correlation was found between IOL-master and OB-820 with interclass correlation of 0.960, 0.968 and 0.976 respectively. Conclusion: IOL-master and OB-820 shouldn’t be used interchangeably due to lack of agreement in axial length measurement which is infact the most important biometry parameter.
- Subjects
OPTICAL devices; LENGTH measurement; ARMED Forces; CATARACT; CROSS-sectional method
- Publication
Pakistan Armed Forces Medical Journal, 2020, Vol 70, Issue 3, p867
- ISSN
0030-9648
- Publication type
Article