Accuracy of swept-source optical coherence tomography based biometry for intraocular lens power calculation: A retrospective cross-sectional study

Abstract

Background: To evaluate the accuracy of biometric measurements by a swept-source optical coherence tomography (SS-OCT) based biometry for intraocular lens (IOL) power calculation. Methods: This retrospective observational study enrolled 431 patients undergoing cataract surgery. The charts were reviewed to investigate the failure rate of axial length (AL) measurement of the SS-OCT biometer, partial coherence interferometry (PCI), and A-scan ultrasonography (US) according to cataract type and severity. AL and keratometry in 164 eyes with the same IOL inserted were measured using the SS-OCT biometer, PCI, and A-scan US. The SRK/T formula was used to calculate IOL power. The mean absolute error (MAE) and percentage of eyes with a prediction error (PE) of ±0.50 D were compared. Results: The AL measurement failure rate was 0.00% for A-scan US, 2.32% for the SS-OCT biometer, and 15.31% for PCI. The number of eyes measured using three devices (SS-OCT biometer, PCI, and A-scan US) was 128 (Group A) and the number of eyes measured using two devices (SS-OCT biometer and A-scan US) was 36 (Group B). The score of posterior subcapsular opacity was significantly different between two groups (p