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 for comparison of continuous 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, 0.02 mm ± 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.

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