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Vienna 2018 Delegate Registration Programme Exhibition Virtual Exhibition Satellites 2018 Survey


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New quantitative analysis of the anterior segment imaging and new biomechanical model of the eye

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Session Details

Session Title: Anterior Segment Imaging II

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

Paper Time: 08:58

Venue: Room A4

First Author: : P.Fedor USA

Co Author(s): :                        

Abstract Details


To evaluate the actual IOL position in comparison to effective lens position (ELP) by new quantitative analysis of the anterior segment (AS) using ultrasound biomicroscopy (UBM) and Lenstar interferometry.


Great Lakes Eye Consultants - Private practice


This is a retrospective non-randomized study comprising 46 eyes of 46 patients with Lenstar and UBM imaging before and after cataract surgery. New system of quantitative AS analysis was developed defining 3 layers of AS: scleral spur, iris and ciliary apex layer. Scleral spur depth (RD), peripheral IPE depth (ID), ciliary apex depth (XD), and corresponding spur-to-spur (RTR), IPE-to-IPE (ITI), apex-to-apex (XTX) were defined. Ciliary angle (CA) and iris angle (IA) describe movement of ciliary-lens membrane (CLM) and iris membrane (IM) in a new biomechanical eye model.


The Lenstar AC was 3.11 +/-0.51 mm, the IMM-AC was 3.22 +/-0.48 mm and the UBM-AC was 3.20 +/-0.50 mm with a correlation coefficients of 0.96 and 0.97 compared to Lenstar. Preoperative RD was 3.86 +/-0.27 mm, ID 4.18 +/-0.29 mm, XD 4.59 +/-0.4 mm, CA was -0.3 +/-12.2 mm, IA 9.7 +/-6.3 mm. Postoperative RD was 3.80 +/-0.27 mm, ID 4.22 +/-0.28 mm, XD 4.76 +/-0.32 mm, CA was -14.57 +/-12.86 mm, IA -0.77 +/- 2.34 mm. Other landmarks and distances are analyzed.


Quantitative UBM (Q-UBM) is suitable for quantitative analysis of the entire anterior segment including ciliary body area based on good repeatability and correlation with Lenstar interferometry.

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