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

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

Purpose:

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.

Setting:

Great Lakes Eye Consultants - Private practice

Methods:

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.

Results:

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.

Conclusions:

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.

Financial Disclosure:

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