Posters

Impact of pterygium surgery on corneal topography

Poster Details

First Author: E.Wakrim FRANCE

Co Author(s):    I. Hajji   S. Belghmidi   A. Moutaouakil              

Abstract Details

Purpose:

The present study has been undertaken in order to investigate the eventual effects of pterygium surgery on both the corneal topography and the contrast sensitivity and to assess any possible association between induced corneal astigmatism and the effects of a successful surgery on topographic corneal values.

Setting:

This study was realized in Ophtalmology Department, University Hospital Mohamed VI, Cadi Ayyad University, Marrakech, Morocco.

Methods:

Our prospective study was performed over 24 months, 60 eyes of 56 patients with primary pterygium were examined for visual acuity, with corrective lenses, keratometry, corneal topography and photography at the slit lamp (64% for men and 36% for women). The refractive and topographic astigmatism were analyzed by comparing the different topographic parameters in two time windows: Before 1 month and 3 months after pterygium excision by conjonctivo-limbal autologous. The evaluated quantitative parameters included; central corneal power (sim K), surface regularity index (SRI), surface asymmetry index (SAI), pterygium horizontal length and the positive axis of astigmatism.

Results:

Our results showed that pterygium has induced a direct astigmatism. After surgery,we reported an amelioration of the visual acuity (VA) of 52 eyes of 3 months (92% of all cases) but the VA of 4 eyes (7%) remained stable (4eyes) without any postoperative deterioration for all patients (p <0.01 ). Concerning the mean astigmatism before and after surgery, it was respectively of [3.86 ± 2.72 D and 1.53 ± 1.02 D, (p <0.01)] at one month and of (1.15 ± 0.62 D) at three months. Following pterygium surgery, the evaluated parameters such as refractive astigmatism, surface regularity index and the surface asymmetry index were found to be statistically significant (p <0.01).

Conclusions:

The analysis of corneal topography gives more insights toward corneal refractive optical variations with respect to other methods and successful pterygium surgery significantly improves visual acuity.

Financial Disclosure:

NONE