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

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,  < 0.001) and the white-to-white measurement (11.97 ± 0.07 vs 12.06 ± 0.07,  < 0.001) differed significantly between the machines. Correlations and agreements were excellent, with perfect agreement for axial length measurement ( = 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,  = 0.51). With Haigis formula, there was a statistically significant difference (21.04 ± 0.52 vs 20.84 ± 0.52,  < 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.