Posters

Prediction of residual astigmatism after cataract surgery with toric intraocular lens (IOL) implantation

Poster Details

First Author: E.Carolina ARGENTINA

Co Author(s):    J. Riera   H. Scarfone                 

Abstract Details

Purpose:

Evaluate residual astigmatism post catarct refractive surgery with toric IOL using Barret  Toric Formula with K Calculator and predicted posterior corneal astigmatism.

Setting:

Clinica de Ojos Tandil, Tandil. Buenos Aires. Argentina.

Methods:

Retrospective case series. N=50. Corneal astigmatism was measured with 3 devices (Tomey TMS-4 topographer, optical low-coherence reflectometry [OLCR]-based Lenstar LS 900; Auto refracto keratometer TOPCOM KR-800) before and after caract surgery. The actual corneal astigmatism was calculated based on refractive astigmatism 3 weeks postoperatively and the effective toric power calculated with the Barret Toric Formula.  The error in the predicted residual astigmatism was calculated by vector analysis according to the measurement and calculation method used to predict the required toric IOL cylinder power.

Results:

The centroid errors in predicted residual astigmatism was 0,02+/- 0,34 in 135º ( Mean Absolute 0,27 +/- 0,20). The centroid postoperative refractive astigmatism was 0,03 +/- 0,33 in 16º (Mean Absolute 0,28 D +/- 0,16).

Conclusions:

The prediction of astigmatic outcomes with Toric IOLs is very accurate using the Barret Toric Formula with K calculator and predicted posterior corneal astigmatism.

Financial Disclosure:

None