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Year : 2018  |  Volume : 11  |  Issue : 1  |  Page : 38-41

Comparison of choroidal thickness using swept-source and spectral-domain optical coherence tomography in normal Indian eyes

Department of Vitreoretinal Services, Aravind Eye Hospital and Institute of Postgraduate Ophthalmology, Coimbatore, Tamil Nadu, India

Correspondence Address:
Siddharth Narendran
Aravind Eye Hospital and Postgraduate Institute of Ophthalmology, Avinashi Road, Coimbatore - 641 014, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ojo.OJO_27_2017

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BACKGROUND/AIMS: Choroidal thickness measurements are reported to differ between spectral-domain optical coherence tomography (SD-OCT) and swept-source OCT (SS-OCT). The aim of this study was to assess the comparability of choroidal thickness measurements using SS-OCT and SD-OCT devices among normal participants. MATERIALS AND METHODS: This was a prospective study of 31 (62 eyes) normal participants. Choroidal imaging was performed sequentially with the Spectralis OCT (SD-OCT) and the deep range imaging OCT (DRI OCT-1) (SS-OCT) using standardized imaging protocols. The subfoveal choroidal thickness (SFChT) was measured manually by two masked retinal specialists. Paired t-tests and intraclass correlation coefficients (ICCs) were used to compare the measurements. RESULTS: The mean SFChT was 319.5 μm and 325.3 μm for DRI OCT-1 and Spectralis OCT, respectively (P = 0.001), with a mean difference of 5.9 with ICC of 0.97. The mean difference in choroidal thickness between the OCT devices was larger among eyes with choroidal thickness > 350 μm compared with eyes with thinner choroids (8.0 μm vs. 4.7 μm). CONCLUSIONS: SFChT measurements are comparable between DRI OCT-1 and Spectralis OCT. The variability between the devices increases in thicker choroids.

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