Comparison of biometry and intraocular lens power calculation performed by a new optical biometry device and a reference biometer

Session Details

Session Title: Imaging II

Session Date/Time: Tuesday 13/09/2016 | 14:00-16:00

Paper Time: 15:04

Venue: Hall C1

First Author: : B.Ventura BRAZIL

Co Author(s): :    M. Ventura   L. Wang   D. Koch   M. Weikert           

Abstract Details

Purpose:

To assess the comparability of biometry measurements and intraocular lens (IOL) power calculations obtained by a new optical A-scan interferometer biometer (Galilei G6, Ziemer Ophthalmic Systems AG, Port, Switzerland) (“new biometer”) and a partial coherence interferometer (IOLMaster, Carl Zeiss AG, Oberkochen, Germany) (“reference biometer”).

Setting:

HOPE Eye Hospital, in Recife, Brazil.

Methods:

Retrospectively, cataract patients who had undergone biometric measurements with the reference biometer and the new biometer were included in the study. Comparisons were performed for axial length (AL), keratometry, anterior chamber depth (ACD), and IOL power calculation to reach emmetropia with a SN60WF IOL (Alcon Laboratories Inc., Forth Worth, USA) using the Haigis formula. The Pearson correlation coefficient was used to determine the interdevice correlation, and the 95% limits of agreement (LoA) were calculated. The paired Student’s t test and the Wilcoxon test were used to assess the differences between devices.

Results:

Eighty-eight eyes (88 patients) were studied. The reference biometer and the new biometer provided statistically similar mean IOL power to reach emmetropia, and AL, keratometry, and ACD measurements (P > .05). The difference in these variables did not vary as their mean increased, and there was a strong positive correlation between the values obtained by both devices for each of the analyzed variables. The 95% LoA for AL was 0.27 mm, for mean keratometry was 1.08 D, for ACD was 0.66 mm, and for IOL power was 1.56 D.

Conclusions:

Both devices were comparable with regards to mean IOL power chosen to reach emmetropia, and mean AL, keratometry and ACD measurements. However, the wide range of differences between the devices with regards to each of the studied variables suggests they should not be used interchangeably.

Financial Disclosure:

... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented