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Purpose: To assess the repeatability of the swept-source optical coherence tomography (SS-OCT) biometer (IOL Master 700) and evaluate its agreement with a partial coherence interferometry (PCI) biometer (IOL Master 500) in patients undergoing routine cataract surgery. Design: This is a prospective, comparative study. Methods: Axial length (AL), keratometry (k), anterior chamber depth (ACD) and white-to-white distance (WTW) values were obtained by PCI-based biometer and compared with those obtained by SS-OCT. A Student ́s t-test was used variables. Pearson’s correlation coefficient and Bland-Altman plots were obtained to describe the correlation and limits of agreement between platforms. Results: The study included 55 eyes with a mean age of 69 ± 11 years of age. The mean differences between swept-source and PCI-based biometry for AL, keratometry, ACD and WTW distance were 0.16 mm ± 2.30, 0.06 D ± 0.38, 1.2mm ± 0.12 and 0.15 mm ± 0.67, respectively. There were statistically significant differences between biometers in two parameters: AL (p = 0.0003) and ACD (p = 0.038). Conclusion: SS-OCT biometry showed high repeatability for all biometric parameters. Keratometry and WTW distance values showed a good level of agreement between SS-OCT and PCI-based biometry. However, AL and ACD measurements showed statistically significant differences between the two optical biometers.

Comparative analysis and repeatability assessment of IOL Master 500 versus IOL Master 700 biometry in cataract patients