Posters

Intraoperative aberrometry for multifocal IOL power choice: can it enhance your surgical outcomes?

Poster Details

First Author: A. Martins PORTUGAL

Co Author(s):    A. Rosa   C. Azenha   M. Silva   M. Oliveira   M. Quadrado   J. Murta     

Abstract Details

Purpose:

Phacoemulsification with multifocal intraocular lens (IOL) implantation is becoming increasingly popular. Precise IOL power calculation is crucial to achieve emmetropia and spectacle independence. The purpose of this study is to assess the accuracy and efficiency in IOL power calculation, based on the preoperative power calculation or measured by intraoperative aberrometry.

Setting:

Centro Hospitalar e Universitário de Coimbra

Methods:

A prospective study was performed. For cataract patients the multifocal IOL power was estimated preoperatively using four formulas: SRKT, Haigis, Holladay and HofferQ, and the predicted errors were obtained. Based on these results the surgeon chose the IOL power targeting emmetropia. Intraoperatively, the Optiwave Refractive Analysis (ORA) System (WaveTec Vision Systems Inc, Aliso Viejo, CA) wavefront aberrometer calculated the IOL power. The spherical equivalent (SE) was evaluated at the 4th week after surgery. A comparative analysis for predictive accuracy of IOL power determination was performed between the preoperative formulas and the intraoperative aberrometry.

Results:

The clinical data included 19 patients submitted to bilateral implantation of a multifocal IOL. The mean power of the IOL implanted was 22.02±4.62. Four weeks after surgery the mean SE was 0,25 ± 0,31, close to the one predicted by ORA (0,27 ± 0,10). The absolute value of SE error calculation, in ascending order of accuracy was: Holladay 1,58 ± 5,79, SRKT 0,60 ± 0,68, HofferQ 0,41 ± 0,52, Haigis 0,40 ± 0,58 and 0,27 ± 0,18 with ORA. SRKT predicted more negative SE values (-0,33 ± 0,85 respectively), unlike what happens with Holladay (0,81 ± 5,95).

Conclusions:

The formula SRKT underestimate the IOL power, contrary to what happens with Holladay. We have also found that the ORA system has the lowest SE error calculation. These results suggest that the intraoperative aberrometry for multifocal IOL power calculation is an important adjunctive tool for optimizing cataract surgery outcomes.

Financial Disclosure:

One or more of the authors research is funded, fully or partially, by a competing company