Posters

Intrasession repeatability of pseudophakic biometric measurements in eyes implanted with two different intraocular lenses using a low-coherence interferometry system

Poster Details

First Author: H.Fukumitsu SPAIN

Co Author(s):    D. Piñero   T. Bernabeu   E. Crespo   P. Ruiz-Fortes   R. Soto-Negro   C. Hernandez     

Abstract Details

Purpose:

To evaluate the level of intrasession repeatability of measurements of the axial length (AL), anterior chamber depth (ACD) and intraocular lens thickness (IOLT) obtained with low-coherence interferometry in pseudophakic patients implanted with two different types of IOLs.

Setting:

Department of Ophthalmology, Marina Baixa Hospital, Villajoyosa (Alicante), Spain.

Methods:

Prospective comparative study including a total of 69 eyes of 69 patients, with ages ranging from 51 to 92 years. All subjects have had previous cataract surgery with implantation of two different IOLs  SN60WF AcrySof IQ,  and M160L Akreos MICS, one month before obtaining the measurements. A complete postoperative ophthalmologic examination including a biometric analysis with the Aladdin system was performed. Three consecutive measurements of AL, ACD and IOLT were obtained to assess the intra-session repeatability. Data analysis included the calculation of within-subject standard deviation (Sw), intrasession precision (1.96 x Sw), coefficient of variation (CV) and intraclass correlation coefficient (ICC).

Results:

Two groups were studied according to the IOL implanted: group 1, 35 eyes (35 patients) implanted with the IOL Acrysof SN60WF, and group 2, 34 eyes (34 patients) implanted with the IOL Akreos MI60. The Sw in both groups was 0.18 mm or below for AL measurements, with ICC of 0.999 or higher. Concerning ACD, the Sw in both groups was 0.66 mm or below, with ICC of 0.956 or higher. The variability of IOLT measurements was high in both groups, with Sw of 1.15 mm or below and ICC of 0.770 or below.

Conclusions:

The Aladdin optical biometer provides consistent and repeatable measurements of AL and ACD in pseudophakic patients. However, the measurements of IOLT provided by this system are not consistent. Possibly, IOLs made of acrylic might not reflect the sufficient light generated by the super luminescent diode of 850 nm of the biometer to obtain an accurate measurement.

Financial Disclosure:

None