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Vectorial analysis of the results of astigmatism correction with excimer laser photoablation

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First Author: L.Castro-Roger SPAIN

Co Author(s):    L. Castro-Roger   I. Carreras-Egaña                 

Abstract Details

Purpose:

To analyse the outcomes of a dataset of refractive surgery patients via vectorial calculations so that future adjustments can be made to achieve a full correction of this refractive error.

Setting:

Centro Andaluz de Microcirugía Ocular (CADMO), based at Granada (Spain).

Methods:

A total of 58 eyes were included in this study. Transposition of surgery effect to vectors was performed, and posterior analysis of them, both arithmetically (simple statistical analysis) and vectorially (vectorial analysis), was performed to our retrospective dataset. Coupling effect study was also included to check the consequences of astigmatic treatment to the sphere.

Results:

The vast majority of parameters show a smaller value for the actual surgery than for the intended, meaning that goals were not fully achieved, in both magnitude and orientation. All in all, surgery reached an index of success of a 77 % and a 55 % in refraction and keratometry respectively. Statistically significant differences were found in the analysis of these parameters regarding corneal astigmatism versus refraction, in favour of a smaller correction in keratometry.

Conclusions:

An overall undercorrection happened in our database, more pronounced in corneal astigmatism. Since refraction is the one to be targeted for a complete correction, this imbalance towards keratometry could be generated because of disregarding it in the planning of the surgery. Despite not achieving the desired result, little effect was generated on the spherical plane.

Financial Disclosure:

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