COMPARISON OF BIOMETRIC PARAMETERS AND THE LEVEL OF AGREEMENT BETWEEN OB820 AND IOL MASTER

  • Fatima Khan Armed Forces Institute of Ophthalmology/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
  • Sadia Humayun Combined Military Hospital/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
  • Imran Basit Armed Forces Institute of Ophthalmology/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
  • Bushra Akbar Armed Forces Institute of Ophthalmology/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
  • Fazla Younis Armed Forces Institute of Ophthalmology/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
  • Mazhar Ishaq Armed Forces Institute of Ophthalmology/National University of Medical Sciences (NUMS) Rawalpindi Pakistan

Abstract

Objective:Compare the axial lengthand other biometric parameters by two biometric devices. Compare their levelof agreement for these parameters.

Study Design:Cross-sectional study.

Place and Duration of Study:Armed Forces Institute of Ophthalmology, fromJul 2016 to Apr 2018.

Methodology:Study was carried out in Armed forced institute of ophthalmology on 70eyes of 53 patients with Nucleus sclerosisgrade II,III cataract.Patients underwentophthalmic and biometric examination usingoptical biometery devices IOL-Master (Carl Zeiss)and OB-820(WaveLight, Germany).Parameters includedaxial length,keratometric indices and anterior chamber depth.Results were evaluated using BlandAltman 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 OB820 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 analysisconfirmedsignificant differenceamongrangesand 95% limits of agreement for Axial Lengthwith interclass correlation of 0.659. While for other parameters including Keratometery1,2andanterior chamber depthexcellent correlation was found between IOL-master and OB-820 with interclass correlation of 0.960,0.968and0.976respectively.

Conclusion:IOL-master and OB-820 shouldn’t be used interchangeably due to lack of agreement in axial length measurementwhich is infact the most importantbiometryparameter.

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Published
2020-06-30
How to Cite
Khan, F., Humayun, S., Basit, I., Akbar, B., Younis, F., & Ishaq, M. (2020). COMPARISON OF BIOMETRIC PARAMETERS AND THE LEVEL OF AGREEMENT BETWEEN OB820 AND IOL MASTER. Pakistan Armed Forces Medical Journal, 70(3), 867-72. Retrieved from https://pafmj.org/index.php/PAFMJ/article/view/4762
Section
Original Articles

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