Repeatability and agreement for measuring anterior segment parameters using IOLMaster 700, LENSTAR LS 900, Galilei G6 and AL-Scan

Session Details

Session Title: Cataract Surgery Equipment. Cataract Surgery Outcomes

Session Date/Time: Monday 07/09/2015 | 16:30-18:30

Paper Time: 16:54

Venue: Main Auditorium

First Author: : K.Deshpande INDIA

Co Author(s): :    M. Kurian   R. Shetty   S. Das   M. Thakkar   L. Kaweri   N. Negalur     

Abstract Details

Purpose:

To assess the repeatability and agreement of a new swept source optical coherence tomography biometer (IOL Master® 700, Carl Zeiss Meditec), an optical low coherence reflectometer (Lenstar 900, Haag-Streit AG, Koeniz, Switzerland), a dual scheimpflug ray tracing biometer (Galilei G6, Ziemer, Switzerland) and a Partial Coherence Interferometer, AL scan (Nidek Co. Ltd., Japan) to measure the keratometry (K), Astigmatism(AST), Axial length(AL), Anterior chamber depth (ACD), central corneal thickness (CCT) and white-to-white (WTW) in cataractous eyes in a prospective study.

Setting:

Narayana Nethralaya, Tertiary eye care hospital in South India

Methods:

Twenty Nine eyes of 29 consecutive patients scheduled for cataract surgery were included. Three consecutive scans was performed using the 4 biometers by a single operator. Within-subject standard deviation (Sw), test–retest repeatability (TRT) and coefficient of variation (COV) for assessing repeatability were assessed. Bland-Altman plots for the agreement between the mean measurements of each machine were examined

Results:

The Mean age of patients was 60. 2 + 10.6 years. Dropouts for AL measurement were significantly higher in AL scan and Galilei G6 compared to IOL Master 700. There was good agreement between IOL Master 700 and Lenstar LS 900 for axial length and keratometry (p<0.5). High variability was seen between the 4 machines for Astigmatism and WTW.

Conclusions:

The new SS-OCT biometer showed valid measurements, good repeatability and good agreement with the OLCR biometer. The new long range SS-OCT biometer was better than the other 3 devices in acquiring axial length measurements in denser cataracts due to better penetration.

Financial Interest:

NONE