Comparison of intraoperative optical coherence tomography of a femtosecond laser with Scheimpflug tomography and anterior segment optical coherence tomography

Session Details

Session Title: Biometry & Quality of Vision

Session Date/Time: Tuesday 25/09/2018 | 08:00-10:30

Paper Time: 08:24

Venue: Room A2

First Author: : M.Böhm GERMANY

Co Author(s): :    E. Hemkeppler   S. Torp   A. Noll   M. Müller   K. Kunert   T. Kohnen     

Abstract Details

Purpose:

Compare agreement of biometric parameters obtained with an intraoperative optical coherence tomography (OCT)-guided femtosecond laser (LenSx) during patient interface docking to the eye with Scheimpflug tomography (Pentacam AXL) and an anterior segment OCT (Visante OCT).

Setting:

Department of Ophthalmology, Goethe-University, Frankfurt am Main, Germany

Methods:

In this prospective study 57 patients (57 eyes), who had planned OCT-guided femtosecond laser-assisted lens surgery, were included. Biometry was performed in mydriasis prior to surgery using Scheimpflug tomography and anterior segment OCT. Before surgery but after patient interface docking to the eye, anterior segment images were taken by an integrated intraoperative OCT of the femtosecond laser that were compared to parameter measurements of the other devices. Outcome measurements were central corneal thickness (CCT), internal anterior chamber depth (ACD), central lens thickness (LT) and nasal and temporal chamber angles. Bland-Altman method or the Wilcoxon-matched-pairs tests were used for analysis.

Results:

The intraoperative OCT and the two other devices revealed clinically relevant differences in all parameters. The intraoperative OCT showed a 9.19 ± 27.55 µm (mean difference) larger CCT (P < 0.05), 0.05 mm (median difference) smaller ACD (P < 0.05) and 0.96 mm (median difference) larger LT (P < 0.001) than Scheimpflug tomography and a 21.36 ± 25.50 µm (mean difference) larger CCT (P < 0.001) and 0.10 mm (median difference) smaller ACD (P < 0.001) than the anterior segment OCT. Reliable quantification of chamber angle differences is not possible due to poor correlation and strong measurement scatter.

Conclusions:

The comparison of biometric parameters of the intraoperative OCT-guided femtosecond laser with Scheimpflug tomography and the anterior segment OCT showed statistically and clinically relevant differences. Differences in biometric parameters may be attributed to measurement errors between devices or patient interface docking to the eye.

Financial Disclosure:

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