Corneal topographic astigmatism (CorT) and its importance in toric IOL planning

Session Details

Session Title: Pseudophakic IOLs: Toric I

Session Date/Time: Saturday 10/09/2016 | 16:00-18:00

Paper Time: 16:36

Venue: Hall C2

First Author: : N.Alpins AUSTRALIA

Co Author(s): :    G. Stamatelatos   J. Ong                 

Abstract Details

Purpose:

To understand how corneal topographic astigmatism (CorT) can be used to accurately calculate toric IOL power and reduce refractive surprise.

Setting:

NewVision Clinics, Melbourne, Australia

Methods:

The parameter CorT is calculated using all the data captured during topography for anterior and total (including posterior cornea) corneal astigmatism measurements. Toric IOL selection was based on CorT and the manifest refractive cylinder postoperatively was compared to the corneal astigmatism as measured using the Zeiss IOL Master, CSO Sirius tomography and Topcon manual keratometry for cases undergoing toric IOL surgery. The Toric IOLs were either AMO Tecnis or Alcon Acrysof IQ.

Results:

The CorT was the preferred parameter for toric IOL power preoperatively in 9 of 11 cases in this pilot study. There were 2 cases where simulated keratometry from topography was preferred. IOL master and manual keratometry were not preferred in any of the 11 cases on retrospective analysis. The corneal astigmatism preoperatively ranged from 1.50 to 4.50D and the manifest refractive cylinder postoperatively ranged from 0.00 to 1.25D. All cases had an improvement in BCVA. The number of cases will be significantly expanded at time of presentation.

Conclusions:

CorT can be used preoperatively as a more consistent parameter of corneal astigmatism compared to simulated keratometry, IOL Master keratometry and manual keratometry when planning toric IOL procedures.

Financial Disclosure:

... gains financially from product or procedure presented