Agreement in Biometric Parameters Between Swept-Source-Optical Coherence Tomography and Optical Low-Coherence Interferometry: Insights into Clinical Precision.

Background/

Objectives

Accurate biometric measurements are critical for achieving optimal refractive outcomes in cataract surgery. This study evaluated the agreement of biometric measurements between a swept-source optical coherence tomography (SS-OCT) biometer (Argos®, Movu Inc.) and an optical low-coherence interferometry (OLCI) biometer (Aladdin®, Topcon Corp.). Parameters analyzed included axial length (AL), anterior chamber depth (ACD), lens thickness (LT), keratometry (K1, K2), and white-to-white corneal diameter (WTW).

Methods

A total of 170 eyes were examined, and agreement was assessed using Bland-Altman analysis, intraclass correlation coefficients (ICCs), and Pearson correlation coefficients.

Results

Excellent agreement was observed for AL (ICC = 0.975), ACD (ICC = 0.960), LT (ICC = 0.951), K1 (ICC = 0.921), and K2 (ICC = 0.927). Moderate agreement was found for astigmatism axis (ICC = 0.655) and cylinder power (ICC = 0.891). Poor agreement was noted for astigmatism-related Jackson cross-cylinder vectors J0 (ICC = 0.334) and J45 (ICC = -0.311), as well as for WTW (ICC = 0.338). Bland-Altman plots demonstrated narrow limits of agreement for most parameters, with mean differences of 0.009 mm for AL and 0.06 mm for ACD.

Conclusions

Both devices demonstrated high degrees of agreement for core biometric parameters, supporting their clinical interchangeability. However, the variability in WTW and astigmatism-related measurements highlights the need for caution when precise corrections are required.