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Barzanouni E, Idani D, Sharifipour F. In Vivo Intraocular Lens Thickness Measurement and Power Estimation Using Optical Coherence Tomography. JOVR [Internet]. 2022Aug.9 [cited 2024Apr.26];17(3):353–359. Available from: https://knepublishing.com/index.php/JOVR/article/view/11572

https://doi.org/10.18502/jovr.v17i3.11572

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authors

  • Ehsan Barzanouni

    Ehsan Barzanouni

    Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  • Diba Idani

    Diba Idani

    School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran
  • Farideh Sharifipour

    Farideh Sharifipour

    Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
    https://orcid.org/0000-0002-1511-9608

Published Date

  • Aug 9, 2022
This journal is publishing all the articles under Creative Commons Attribution License CC BY 4.0.

In Vivo Intraocular Lens Thickness Measurement and Power Estimation Using Optical Coherence Tomography

Journal of Ophthalmic and Vision Research (JOVR) / July–Sep 2022, Volume 17, Issue 3 / Pages 353–359

Abstract

Purpose: To estimate the power of an implanted intraocular lens (IOL) by measuring IOL thickness using anterior segment optical coherence tomography (AS-OCT) and to assess the repeatability of measurements.


Methods: Ninety-seven eyes were studied one month after uneventful phacoemulsification within the bag Acrysof SA60AT IOL implantation (range +11 to +35). All eyes had postoperative refraction of ±0.5 D of target refraction. AS-OCT was used to measure the central thickness of the IOL. Correlation between labelled IOL power and central IOL thickness as well as the measure of repeatability, for example, intraclass correlation coefficient (ICC), were evaluated. IOL thicknesses were also calculated using a formula and compared with AS-OCT-derived measurements.


Results: IOL thickness correlated significantly with labelled IOL power (R2 = 0.985, P < 0.001). The regression equation (IOL Power = [0.04 × IOL thickness in micron] – 7.56) indicates 25 microns of central IOL thickness change per 1D power change. Over the studied range, IOL power could be estimated with a precision of 0.85 ± 0.02 D (95% confidence interval: 0.83–0.94D). ICC for repeated measurements was 0.999. There was a significant correlation between calculated and measured (AS-OCT) IOL thickness (R2 = 0.984, P < 0.001).


Conclusion: Central IOL thickness measurements with the AS-OCT are highly repeatable and closely correlated with the labelled IOL power, which can predict the IOL power with ±0.85 D from the actual power. This method can be helpful in cases of postoperative IOL surprise.

Keywords:

Anterior Segment Optical Coherence Tomography, AS-OCT, Intraocular Lens, IOL, IOL Thickness

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