Comparing the Argos optical biometer to the Lenstar optical biometer, Pentacam and topolyzer

Session Details

Session Title: Ocular Infections & Other Topics

Session Date/Time: Sunday 15/09/2019 | 08:00-10:00

Paper Time: 09:06

Venue: Free Paper Forum: Podium 4

First Author: : A.Cummings IRELAND

Co Author(s): :    E. Brennan   S. Naughton   A. Coen                       

Abstract Details

Purpose:

The aim of this study was to compare the accuracy of the Argos Biometer using swept-source OCT (SS-OCT) with the Lenstar Biometer LS900 using partial coherence interferometry (PCI), Oculyzer (Scheimpflug camera) and Topolyzer (Placido disk topographer) measurements with regards to axial length (AL), anterior chamber depth ACD and corneal data in patients who had cataract surgery or refractive lens exchange (RLE).

Setting:

A single site, non-interventional retrospective study comparing measurements from the Argos biometer, the Lenstar LS900, the Topolyzer and the Oculyzer. Patients underwent biometry as part of their standard of care assessments at the Wellington Eye Clinic, Dublin Ireland when considering cataract surgery or RLE.

Methods:

Argos, Lenstar, Topographer and Oculyzer data was analysed. 299 eyes were included to assess reliability and accuracy of axial length (AL), corneal curvature (K readings), anterior chamber depth (ACD), central corneal thickness (CCT), lens thickness (LT), white to white (WTW) and pupil size measurements. The refractive outcomes (UDVA, CDVA, sphere, cylinder and axis) for 94 of the 299 eyes were analysed to assess IOL predictability as postoperative refractive data was available for these eyes. 45 eyes were virgin eyes, 49 were post-refractive surgery eyes. The remaining eyes had not proceeded to surgery at the time of data collection.

Results:

299 eyes were assessed. Argos measured all eyes successfully, but 5 eyes (grade 4 + NS cataract) could not be measured by the Lenstar and an IOL power could not be predicted. Axial length measurements were highly correlated between the Argos and the Lenstar with a 0.9863 correlation coefficient (20mm to 30mm AL of 0.899 R2). In 45 virgin eyes, where refractive outcomes were available postoperatively, Argos provided better outcomes when comparing the predictive refractive outcome of a specific power IOL and the actual refractive outcome achieved 6 weeks postoperatively. Argos SS-OCT showed a higher predictability when compared to Lenstar.

Conclusions:

The predictive accuracies of the Argos SS-OCT and Lenstar PCI optical biometers are very similar, except for in medium (AL 22.05-25.00mm) and long eyes (AL 25.06-29.68mm), in which the predictive accuracy of Argos SS-OCT biometry was higher. The Argos SS-OCT does tend to measure the long eyes a fraction shorter while the short eyes measure a fraction longer. The Argos SS-OCT provided better outcomes when comparing the predictive refractive outcome with a specific power IOL and the actual refractive outcome obtained six weeks postoperatively with that same IOL.

Financial Disclosure:

research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented