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Predicting the post-operative intraocular lens position using continuous intraoperative optical coherence tomography measurements and partial least squares regression

Session Details

Session Title: Cataract II

Session Date/Time: Saturday 16/02/2013 | 08:30-11:00

Paper Time: 10:39

Venue: Hall 1

First Author: : N.Hirnschall AUSTRIA

Co Author(s): :    S. Amir Asgari   S. Mהdel   O. Findl        

Abstract Details


Aim of this study was to assess, if measuring the position of the lens capsule intra-operatively with a continuous intra-operative optical coherence tomography (OCT) device could be useful to improve the prediction of the IOL position.


VIROS - Vienna Institute for Research in Ocular Surgery, a Karl Landsteiner institute, Hanusch Hospital, Vienna, Austria


This prospective study included patients who were scheduled for cataract surgery. A prototype operating microscope with an integrated continuous OCT device (Visante attached to OPMI VISU 200, Carl Zeiss Meditec AG, Germany) was used to measure the anterior and posterior lens capsule position at different time points during cataract surgery. In all cases a capsular tension ring (CTR) was used to tauten the lens capsule. Partial coherence interferometry (AC-Master, Carl Zeiss Meditec AG, Germany) was used to measure anterior chamber depth (ACD) immediately before, and 1 hour and 3 months post-operatively. Partial least squares regression (PLSR) was used to assess the influence of different pre- and intra-operatively measured parameters.


In total, 70 eyes of 70 patients were included. Mean axial eye length was 23.6mm (range: 20.6mm to 30.8mm), mean used IOL power was 22.2D (range: 6.0D to 31.5D). PLSR showed that the anterior lens capsule measured after removing the crystalline lens and after implanting a CTR was a significantly better predictor for the post-operative ACD compared to pre-operative ACD measurements.


The main problem of IOL power calculation, the prediction of the IOL position after surgery, could possibly be reduced by using intra-operative lens capsule measurements instead of pre-operative ACD measurements.

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