Refractive Accuracy And Visual Outcomes In Long And Short Eyes Using Alcon Argos® Biometer

Traditional biometers using PCI (Partial Coherence Interferometry) and OLCR (Optical Low Coherence Reflectometry) fall short in accurate axial length measurements in high myopes and hypermetropes. New biometers are based on principle of Swept-source OCT (SS-OCT) with high axial and lateral resolution in taking scans. It improves the success ratio and repeatability of its measurements. This research study aims to determine if ARGOS® can accurately estimate the IOL power in eyes with long and short axial length (AL) and provide consistent and accurate post-operative results

Investigator initiated, prospective, single-center, observational study conducted at a tertiary hospital

Patients undergone uncomplicated age related cataract surgery were included in this investigator initiated, prospective, single-center, observational study. Pre operative axial length measurement for IOL calculation was done using Barrett universal formula. Patients were divided into 2 groups based on their axial length – long AL (>26.00 mm) and short AL (<22.50 mm). Post operative assessment at 1 month included refraction, visual acuities and ocular health.

66 eyes of 39 patients were included this study. The mean age (± SD) of participants was 61 years (± 7.65). There were 13 and 53 eyes included in long AL & short AL group respectively. The median (IQR) absolute error between predicted residual error by Argos® Biometer and post operative spherical equivalent was 0.22 (0.11, 0.31). It was higher in long AL compared with short AL eyes (0.28, [0.21, 0.62] vs 0.21 [0.11, 0.28]; p=0.068). 

In eyes with short and long axial length; accurate refractive outcome prediction can be possible using swept-source optical coherence tomography based biometry.