Posters

Comparison of the results of implantation of premium toric lenses using the actual and theoretical values of the posterior corneal surface

Poster Details

First Author: K.Buusova Smeckova CZECH REPUBLIC

Co Author(s):    Z. Smecka   B. Strnadova   A. Kovacikova              

Abstract Details

Purpose:

Patients with toric trifocal intraocular lenses are very demanding and expect excellent postoperative results. The aim of our paper is to compare the calculation of toric intraocular lenses with Barrett formula using theoretical calculations and actual values from the total keratometry of the cornea using Barrett TK.

Setting:

Eye Clinic Zlin, Zlin, Czech Republic

Methods:

Consecutive study, 35 eyes with PanOptix toric IOL, patients age 50 to 68 years. Refractive error -4,25 to +5 Dsf (IOLs +15,5 to +27D), astigmatism up to -5 Dcyl (T20 to T60). Preoperatively standard examination including IOL Master 700 Total Keratometry. Standard uneventful surgery, Verion used for navigation. 6 weeks postoperatively UCVA, autorefractometry and axis of the lens examined. Data inserted into Berdahl & Hardten Toric IOL Calculator in order to set the best implantation axis. Results compared with both Barrett and Barrett TK to evaluate the predictive potential of both methods.

Results:

100% of patients had monocular UCVA 0,8, 83% 0,9 and better. No enhancement was needed. Postoperative astigmatism based on autorefractometry ranged from 0,25 to +1,25 Dcyl (higher preop. astigmatism values than IOL range). In 60% of cases, bothe Barrett and Barrett TK were with 1°appart. In 17% of cases Barrett was more accurate, in 13% Barrett. TK performed better in cases with higher residual astigmatism and higher preoperative astigmatism. Values of astigmatism of keratometry and total keratometry variated from 0,05 to 0,33 with mean value of 0,17.

Conclusions:

In recent years, toric lenses have become an indispensable part of not only premium lens implantation, but also conventional cataract. Indication and calculation of a suitable implant requires experience and proper technical equipment.Total Keratometry takes into account the individual posterior surface.. Moreover, these measurements are integrated into one device, so it is not necessary to solve various technical parameters of individual devices. Both Barrett and Barrett TK yield very good and predictable results, in 60% of cases without significant difference. On the other hand, TK performed better in cases with higher astigmatism and those where higher postoperative astigmatism was measured.

Financial Disclosure:

... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, ... receives consulting fees, retainer, or contract payments from a competing company