Impact of asphericity and folding of intraocular lenses on the intraoperative aberrometry used to improve refractive outcome

Session Details

Session Title: IOL Power Calculations, Post-LASIK & Extreme Eyes

Session Date/Time: Tuesday 25/09/2018 | 14:00-16:00

Paper Time: 14:24

Venue: Room A2

First Author: : I.Fischinger GERMANY

Co Author(s): :    M. Tetz                    

Abstract Details

Purpose:

To improve the predictability of the postoperative refraction by measuring intraoperative aberrometry focusing on the asphericity and the intraoperative folding of the IOL. Therefor two types of IOL’s (Abbott Tecnis® IOLs (ZCB00®, ZCTxxx, ZKB00, ZLB00, ZMTxx & ZMB00®) and for Bausch Lomb IOL (toric and nontoric Envista®))were investigated.

Setting:

Augentagesklinik-Spreebogen, Berlin, Germany

Methods:

The study evaluated the implantation of 100 IOL’s, 50 aspherical neutral, toric Envistas® and 50 aspherical, toric, multifocal Tecnis®. All surgeries were performed by a single experienced surgeon. After implantation of the IOL suggested by an IOL-calculation formula based on preoperative biometry (IOL-Master®), removal of the viscoelasticum and normotonisation, aberrometry was performed on the table using the intraoperative wavefront analyzer I-O-W-A®(Eyesight&Vision GmbH, Germany). The intraoperative measurement of spherical equivalent, cylinder and axis was compared with the subjective follow-up results acquired 6 weeks postoperatively, what allowed us to deduce correction factors for the Tecnis® & the Envista® IOL family.

Results:

The asphericity of the IOL’s which has a bigger impact on the intraoperatively measurement due to the dilated pupil caused an offset of intraoperative aberrometry of sphere of 0.15 D for the Envista® and 1.15 D for the ZCB00® compared with the postoperative measurements. The folding of the IOL caused an additional cylinder of 1.3 D for the Envista® and 0.9 D at the end of surgery for the ZCB00®.

Conclusions:

Intraoperative aberometry allows an accurate prediction of the final postoperative refraction if IOL-specific offsets for astigmatism and asphericity are taken into consideration. This allows intraoperative control of the refractive outcome at the end of surgery.

Financial Disclosure:

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