Comparison of four IOL calculation approaches with and without a model for the compensation of posterior corneal astigmatism

Session Details

Session Title: Presented Poster Session: Toric IOLs

Venue: Poster Village: Pod 1

First Author: : V.Pfeifer SLOVENIA

Co Author(s): :    A. Ursic   M. Schwarzbartl Pfeifer                    

Abstract Details

Purpose:

To compare four calculators for toric intraocular lens (IOL) calculation with two formulas incorporating the posterior corneal astigmatism (PCA) and two standard calculators.

Setting:

Outpatient surgery center Ljubljana Slovenija

Methods:

De-identified IOLMaster 700 biometry and keratometry data of 193 patients who had previously undergone successful cataract surgery and toric IOL implantation (ZEISS AT Torbi 709) were provided to perform a retrospective analysis on different IOL calculation algorithms: Haigis-T, Barrett toric, Z CALC 1.5 and Z CALC 2.0.

Results:

The results show for both formulas incorporating the PCA a lower prediction error in spherical equivalent (Barrett toric -0.10 D, Z CALC 2.0 0.11 D vs. Haigis -0.18 D, Z CALC 1.5 -0.16D) as well as in cylinder (Barrett toric -0.18 D, Z CALC 2.0 -0.12 D vs Haigis -0.33 D, Z CALC 1.5 -0.30 D).

Conclusions:

A consideration of the PCA with the help of a model can improve the postoperative refractive outcome.

Financial Disclosure:

... gains financially from product or procedure presented, ... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, ... is employed by a for-profit company with an interest in the subject of the presentation, ... has significant investment interest in a company producing, developing or supplying product or procedure presented