Free Papers

The evaluation of refractive, anterior, posterior and total corneal astigmatism using a Scheimpflug topography in pseudophakic eyes.

Free Paper Details

First Author: L.Hazar TURKEY

Co Author(s):    E. Vural                    

Abstract Details

Purpose:

The purpose of this study was evaluating refractive (RA) and corneal astigmatism, including total corneal astigmatism (TCA), anterior corneal astigmatism (ACA), and posterior corneal astigmatism (PCA) in pseudophakic eyes.

Setting:

Kızıltepe State Hospital, Mardin, Turkey

Methods:

One hundred and fifty eyes of 122 patients with non-toric intraocular lenses and have low to moderate astigmatism were included in this study. Autoref-keratometry (Tomey RC-5000, Japan) was used for refractive astigmatism measurements and Scheimpflug camera combined with a Placido corneal topographer (Sirius System, CSO, Italy) for corneal astigmatism. The power vector components J0 and J45 were analyzed. The Pearson correlation coefficient and Bland-Altman plots were used to assess the relationship and agreement between refractive and corneal astigmatism.

Results:

The mean patient age was 65.6 ± 9.9 years. The 95% limits of agreement width for each J0 value were high for the comparison between RA and ACA (difference: –0.15 ± 0.39 D) and low for the comparison between RA and TCA (difference: –0.07 ± 0.39 D). The refractive J0 and total corneal J0 values were well correlated (J0: r = 0.701, p < 0.001); The refractive and anterior corneal J0 values were moderately correlated (J0: r = 0.684, p < 0.001; J45: r = 0.517, p <0.001).

Conclusions:

Refractive astigmatism and TCA showed good agreement in pseudophakic eyes with low to moderate astigmatism. Considering the correction of astigmatism, based on TCA seems more accurate than ACA.

Financial Disclosure:

-