Abstract
Purpose :
To compare the axial length measurements from a hyperparallel OCT (HP-OCT, Cylite) biometer and a swept-source (SS) OCT biometer (IOLMaster 700, Carl-Zeiss Meditec).
Methods :
Patients who were candidates of the cataract surgery were enrolled in the study. Axial length measurements using HP-OCT and SS-OCT biometers were acquired following pupil dilation by the same experienced operator (HM). The order in which the biometers were used was randomized. The measurements of the same eye were acquired in less than 30 minutes. Agreement between the axial length measurements of the biometers was evaluated using the Bland-Altman method with a nested mixed-effects model.
Results :
Sixty-four cataract patients (112 eyes) had axial length measurements acquired with HP-OCT and SS-OCT biometers. The mean age was 71.0 ± 8 years (range 44 to 84 years). One hundred nine eyes had undergone prior laser vision correction (87 eyes had myopic LASIK or PRK, seven had hyperopic LASIK, and 15 eyes had RK). Ninety-two eyes (82%) had a nuclear sclerosis severity grade of 2+ or more in the crystalline lens. The mean axial length was 25.10 ± 1.34 mm for HP-OCT and 25.10 ± 1.33 mm for IOLMaster 700. The Bland-Altman plot (Figure 1) showed excellent agreement between the axial length measurements made by the two devices. The mean difference with a nested mixed-effects model was 0.00 mm, with 95% limits of agreement from -0.06 mm to 0.06 mm.
Conclusions :
The HP-OCT and SS-OCT biometers showed excellent agreement in axial length measurements.
This abstract was presented at the 2024 ARVO Annual Meeting, held in Seattle, WA, May 5-9, 2024.