Comparison of ocular biometric measurements between a new swept-source optical coherence tomography and a common optical low coherence reflectometry

Purpose. To report choroidal thickness and volume in healthy eyes using swept source optical coherence tomography (SS-OCT).Methods. A prospective observational study of 122 patients examined with swept source OCT (DRI-OCT, Topcon, Japan). In each eye, we performed 256 horizontal scans, 12 mm in length and centered on the fovea. We calculated choroidal thickness manually with a built-in caliper and automatically using DRI-OCT mapping software. Choroidal volume was also automatically calculated. We measured axial length with optical low-coherence reflectometry (Lenstar LS 900, Haag-Streit, Switzerland).Results. The choroid has focally increased thickness under the fovea. Choroid was thinnest in the outer nasal quadrant. In stepwise regression analysis, age was estimated as the most significant factor correlating with decreased choroidal thicknessF=23.146, P<0.001followed by axial lengthF=4.902, P=0.03. Refractive error was not statistically significantF=1.16, P=0.28.Conclusions. SS-OCT is the first commercially available system that can automatically create choroidal thickness and volume maps. Choroidal thickness is increased at the fovea and is thinnest nasally. Age and axial length are critical for the estimation of choroidal thickness and volume. Choroidal measurements derived from SS-OCT images have potential value for objectively documenting disease-related choroidal thickness abnormalities and monitoring progressive changes over time.

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Agreement and clinical comparison between a new swept-source optical coherence tomography-based optical biometer and an optical low-coherence reflectometry biometer

Eye ◽

10.1038/eye.2016.241 ◽

2016 ◽

Vol 31 (3) ◽

pp. 437-442 ◽

Cited By ~ 18

Author(s):

P Arriola-Villalobos ◽

J Almendral-Gómez ◽

N Garzón ◽

J Ruiz-Medrano ◽

C Fernández-Pérez ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Optical Coherence ◽

Swept Source ◽

Low Coherence ◽

Clinical Comparison ◽

Optical Biometer ◽

Optical Low Coherence Reflectometry

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Comparison of two biometers: A swept-source optical coherence tomography and an optical low-coherence reflectometry biometer

European Journal of Ophthalmology ◽

10.1177/1120672118802918 ◽

2018 ◽

Vol 29 (5) ◽

pp. 547-554 ◽

Cited By ~ 2

Author(s):

Hussam El Chehab ◽

Emilie Agard ◽

Corinne Dot

Keyword(s):

Optical Coherence Tomography ◽

Intraocular Lens ◽

Anterior Chamber Depth ◽

Swept Source ◽

Low Coherence ◽

Intraocular Lens Power ◽

Biometric Measurements ◽

Lens Power ◽

Optical Low Coherence Reflectometry ◽

Iolmaster 700

Purpose: The technological improvements in optical biometers have made cataract surgery evolve to the level of refractive surgery. This study assessed the correlation and agreement between a biometer using swept-source optical coherence tomography technology (IOLMaster 700; Carl Zeiss Meditec, Jena, Germany) and a biometer using optical low-coherence reflectometry (Lenstar; Haag Streit, Koeniz, Switzerland). Procedures: Optical biometric measurements were taken with the IOLMaster 700 and the Lenstar on 129 eyes of 129 patients referred for cataract surgery. We compared biometric data (axial length, mean keratometry, central pachymetry, anterior chamber depth, lens thickness, and horizontal white-to-white measurement) and the emmetropic intraocular lens power calculated with SRK/T and Haigis formulas. Correlation and agreement for these parameters were evaluated. Results: Only anterior chamber depth measurements (3.05 ± 0.07 vs 3.07 ± 0.07, p < 0.001) and the white-to-white measurement (11.97 ± 0.07 vs 12.06 ± 0.07, p < 0.001) differed significantly between the machines. Correlations and agreements were excellent, with perfect agreement for axial length measurement ( r = 1, intraclass correlation coefficient = 1). Emmetropic intraocular lens power did not differ between devices with SRK/T formula (20.94 ± 0.51 vs 20.92 ± 0.50, p = 0.51). With Haigis formula, there was a statistically significant difference (21.04 ± 0.52 vs 20.84 ± 0.52, p < 0.001). Conclusion: This study suggests that there is a very high correlation and agreement for the biometric measurements and calculation of intraocular lens implant power with the SRK/T formula.

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