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Using dynamic Purkinje meter measurements to evaluate capsular bag stability in special cases

Session Details

Session Title: Cataract II

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

Paper Time: 09:29

Venue: Hall 1

First Author: : S.Maedel AUSTRIA

Co Author(s): :    N. Hirnschall   M. Weber   J. Tabernero   P. Artal   O. Findl  

Abstract Details


To evaluate capsular bag stability in eyes with versus without implantation of a capsular tension ring (CTR) during cataract surgery, and eyes with pseudoexfoliation syndrome (PXF) using a novel dynamic Purkinje meter system.


Vienna Institute for Research in Ocular Surgery, Department of Ophthalmology, Hanusch Hospital, Vienna.


In this prospective randomized study cataract patients with and without PXF were included. Cataract surgery was performed as standard, but in non PXF eyes half of the patients received a CTR in a randomized fashion. Dynamic Purkinje meter measurements were performed pre-operatively, 1 hour, 1 week and 3 months post-operatively. The novel dynamic Purkinje meter system allows to evaluate crystalline lens and IOL oscillation or “wobbling” immediately after change direction of gaze by video recording of saccadic eye movements. Wobbling can be quantified by terms of oscillation amplitude (pixels) or mean stationary time (msec), representing the time the oscillating lens/IOL needs to return to its original centered position. Higher oscillation amplitudes and larger stationary time indicate larger degrees of lens/IOL wobbling.


In total, 50 eyes of 30 patients will be included and presented at the meeting. Recently, clinical feasibility of the dynamic Purkinje meter was shown to be good, and a measurable wobble effect was detected in all patients. Preliminary results for the clinical comparison concerning wobbling of eyes with and without capsular tension ring and with PXF will be presented.


This novel device may be useful to assess the effect of a CTR in early post-operative IOL performance during the phase of capsule bag shrinkage. Another aim of this study is to assess whether pre-operative crystalline lens wobbling can be used to detect eyes at risk for intraoperative capsular complication, zonulolysis and postoperative pseudophakodonesis.

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