Novel intraoperative swept-source optical coherence tomography measurements of the aphakic eye for intraocular lens position prediction

Session Details

Session Title: Posterior Capsule Opacification/IOL Power Calculations

Session Date/Time: Tuesday 17/09/2019 | 14:00-16:00

Paper Time: 15:22

Venue: Free Paper Forum: Podium 2

First Author: : N.Hirnschall AUSTRIA

Co Author(s): :    S. Amir-Asgari   J. Hienert   H. Matz   O. Findl                    

Abstract Details

Purpose:

To evaluate a novel swept source optical coherence tomography (ssOCT) devicefor intra-operative anterior chamber depth (ACD) measurements of the aphakic eye (iACD) to predict the post-operative ACD.

Setting:

Hanusch hospital, Vienna, Austria

Methods:

This prospective study included patients scheduled for cataract surgery. All patients received a plate haptic IOL (Asphina, Carl Zeiss Meditec AG, Germany) and no capsular tension ring. Pre-operatively, optical biometry was performed (IOLMaster 700, Carl Zeiss Meditec AG, Germany). Intra-operatively, a prototype set-up was used that allowed to perform ssOCT scans of the anterior eye segment (IOLMaster700 connected with OPMI Lumera 700, both CZM). iACD was measured and used to predict the post-operative IOL position. Optical biometry and subjective refraction and autorefraction (Topcon RM 8800, Topcon, Japan) were performed 2 months after surgery.

Results:

In total, 70 eyes of 70 patients were included. Although iACD measurements showed a better predictive power for the post-operative IOL position compared to pre-operative ACD measurements and anterior segment measurements (corneal epithelium to posterior lens capsule), a combination of intra-operative ACD and pre-operative ACD increased the predictive power significantly (p=0.006). Pre-operative, intra-operative and combined measurements resulted in a prediction error of more than 0.25mm in 24.1%, 19.4% and 15.2%, respectively. These findings were confirmed in a boot strapping model.

Conclusions:

iACD measurements were shown to be superior to pre-operative ACD measurements. Combining pre- and iACD measurements improved the prediction further.

Financial Disclosure:

is employed by a for profit company with an interest in the subject of the presentation, receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented