Posters

Surgically induced astigmatism based on refractive corneal parameters

Poster Details

First Author: G.Velarde SPAIN

Co Author(s): I. Jiménez-Alfaro   P. Pérez-Merino                 

Abstract Details

Purpose:

To predict the impact of surgically induced astigmatism with the analysis of different corneal refractive parameters.

Setting:

Hospital Ruber Juan Bravo, Madrid, Spain

Methods:

The study comprises patients underwent uncomplicated cataract surgery. The inclusion criteria was no history of previous surgery or disease which could affect corneal topography or cataract surgery and a follow up at least one month after the intervention. A total of 67 eyes were included in the study (39%, males; 61%, females), with an average age of 60±25. The pre- and post-operative measurements include refractive error, visual acuity and corneal topography. The commercial software of the Pentacam allowed the extraction of the elevation points of the corneal surfaces for ray-tracing analysis. Refractive and aberrometry astigmatism changes were calculated.

Results:

There was high correspondence between refractive and aberrometry astigmatism (r=0.987; p<0.001). Pre-operatively, the horizontal and vertical components of the aberrometry astigmatism were -0.3±1.1 D [-4.3, 2 D] and 0.5±0.8 D [-2, 2.5 D], respectively. The surgically induced astigmatism (SIA) was 0.3±0.5 D [-0.8, 1.4 D] and -0.1±0.6 D [-3.3, 1.2 D]. On average, the root-mean square (RMS) of the high-order aberrations (HOAs) was 0.25±0.11 μm [0.1,0.6 μm]. Finally, we found correlation between the HOAs and the SIA (Pearson coefficient correlation; p= 0.021).

Conclusions:

The surgically induced astigmatism shows high variability between a normal patient population and is associated with the magnitude of corneal irregularities. The three-dimensional analysis of the corneal surfaces and different refractive corneal parameters (astigmatism and HOAs) might open new avenues to predict the impact of the surgically induced astigmatism.

Financial Disclosure:

None