ABSTRACT
A significant degree of corneal astigmatism can be induced by the encroachment of a pterygium on to the cornea, which can have a significant impact on vision. There is a significant correlation between the extension of the pterygium on to the cornea and the amount of induced astigmatism. The pterygium generally causes With the Rule astigmatism that is hemi-meridional on the side of pterygium. This study was undertaken to evaluate the effect of successful pterygium surgery on existing refractive astigmatism. Four eyes with primary pterygium with astigmatism were analysed before and after pterygium excision. Astigmatism increased with the increase in the grade of pterygium, and subsequent excision of the pterygium brought a significant decrease in With the Rule astigmatism