The results of immersion A-B-scan axial length measurement in eyes with dense cataract

Session Details

Session Title: Cataract Surgery Equipment/Instrumentation/Surgical Devices II

Session Date/Time: Monday 12/09/2016 | 17:00-18:30

Paper Time: 17:34

Venue: Hall C1

First Author: : L.Romanova RUSSIA

Co Author(s): :    T. Kiseleva   O. Oganesyan   K. Lugovkina              

Abstract Details

Purpose:

This study is to determine the accuracy of the axial length (AL) measurement methods in patients with dense cataract using contact ultrasound A - and B - scan methods and immersion ultrasound A - and A - B - scan methods.

Setting:

Helmholtz Moscow Research Institute of Eye Diseases, Moscow, Russia

Methods:

This was a retrospective analysis of 130 eyes with dense cataract (130 patients) aged 65,8 ± 5,3 years. All patients underwent contact A-scan examination (US-4000, NIDEK), immersion A-scan (Accutome A-Scan synergy, Zeiss), contact B-scan (Voluson 730 pro, GE Healthcare), immersion AB-scan with prior B - scan localization of the fovea (the UD-6000, Tomey), ultrasound velocity in the lens 1629 m/s. In the postoperative period control AL measurements were performed using IOL-Master. In 97 patients the values of AL were less than 25.0 mm, in 33 patients - more than 25.0 mm (minimum - 22.0 mm, maximum - 27.2 mm).

Results:

The average values obtained by contact A - method were 23.6 mm (m ± 0,23 mm), immersion A-method - 23.77 mm (m ± 0,24 mm), contact B-method - 23.5 mm ( m ± 0,21 mm), immersion A-B -method 23.75 mm (m ± 0,23 mm). The mean value of control IOL-Master measurements was 23.71 mm (m ± 0,23 mm). There was no significant deviations between the results, obtained by different biometry methods, with the exception of the contact B-method. The biggest variation of AL measurements was obtained in patients with high myopia, immersion A-B -method was accurate in all cases.

Conclusions:

Immersion A-B – biometry technique allows to achieve accurate AL measurement for IOL power calculation in patients with dense cataract even in the high myopia cases. The results of the contact B-biometry can’t be used for IOL power calculation.

Financial Disclosure:

NONE