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. 2023 Jan 25;63(1):71-76.
doi: 10.60787/NMJ-63-1-83. eCollection 2022 Jan-Feb.

Comparing Central Corneal Thickness Using Ultrasound and Anterior Segment Optical Coherence Tomography Pachymetry in Adults Attending A Private Eye Clinic in Abuja

Adaora C Okudo  1 , Olufemi E Babalola  1
Affiliations

Comparing Central Corneal Thickness Using Ultrasound and Anterior Segment Optical Coherence Tomography Pachymetry in Adults Attending A Private Eye Clinic in Abuja

Adaora C Okudo et al. Niger Med J. .

Abstract

Background: Central Corneal Thickness (CCT) measurement is useful in the management of glaucoma, ocular hypertension, corneal lesions and kerato-refractive surgeries. The study aims to compare the CCT measurements between Ultrasound Sonography (USS) and Optical Coherence Tomography (OCT), to analyze correlation and agreement between these instruments as well as repeatability of each instrument.

Methodology: A cross sectional comparative study carried in 100 eyes of 50 patients attending Rachel Eye Center in Abuja from January to March 2021. The CCT were taken using the USS and OCT. CCT was measured using the Pachscan ultrasound and the Optovue machine utilised for the OCT technique. Data was analysed using SPSS version 20 using Paired Sample t Test, Pearson's correlation, Interclass Correlation and Bland Altman Methods.

Results: Patients were aged between 18 and 79 (mean age of 39.1), 72 males and 28 females. The mean CCT was 537.36 ±33.26 and 510.94 ±33.13 for USS and OCT respectively with a mean difference of (26.42±9.53 p<0.001). There was a very strong correlation of the 2 sets of measurement r = 0.997 p<0.001. There was a high average mean intraclass correlation coefficient of 0.843 between the two instruments and this was excellent (0.961) within the 95 percentile upper limit but poor in the (0.096) lower limit. There was a high correlation and no statistical significant difference in the comparing repeated mean USS and OCT measurements. There was an excellent average mean Intraclass Correlation Coefficient of 0.999/0.997 for the repeated OCT and USS values and this was found to be excellent(0.999/0.998) within the 95 percentile upper limit and (0.997/0.994)lower limit respectively.

Conclusion: We find that measurements of CCT using the Pachscan ultrasound and the Optovue OCT correlate well, but the mean Pachscan measures were significantly higher than Optovue measures.

Keywords: Central Corneal Thickness; Optical Coherent Tomography; Ultrasound Pachymetry.

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Figures

Figure 1:
Figure 1:
Bland Altmans plot with 95% limit of agreement
See this image and copyright information in PMC

References

    1. Doughty MJ, ZM, Human corneal thickness and its impact on intraocular pressure measures: A review and meta-analysis approach. Surv Ophthalmol. 2000; 44:367-408. - PubMed
    1. Gillis A, Zeyen T. Comparison of optical coherence reflectometry and ultrasound central corneal pachymetry. Bull Soc Belge Ophthalmol 2004; 292:71-5. - PubMed
    1. Çomçalı Sebile Üstün, Raşit Kılıç, Serdar Bayraktar, Yasin Çakmak, Zeliha Yazar, Hafize Sezer, Ayhan Dursun “Comparison of Ultrasonic Pachymetry and Optical Coherence Tomography for the Measurement of Central Corneal Thickness” Glo-Kat 2016;11:93-96
    1. Ramesh PV, Jha KN, Srikanth K. Comparison of Central Corneal Thickness using Anterior Segment Optical Coherence Tomography Versus Ultrasound Pachymetry. J Clin Diagn Res. 2017;11:NC08-NC11. doi:10.7860/JCDR/2017/25595.10420 - DOI - PMC - PubMed
    1. Northey LC, Gifford P, Boneham GC. Comparison of Topcon opticalcoherence tomography and ultrasound pachymetry. Optom Vis Sci 2012; 89:1708-14. - PubMed

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