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A growth of fibrovascular tissue that extends onto the cornea is called pterygium. One of the major issues of patients with pterygium is blurred vision. In advanced cases, impaired vision can occur as a result of pterygium growing directly to cover the pupil. However, in less severe cases, pterygium may also indirectly impair vision through elevated pressure and corneal surface deformation that results in ocular abnormalities. The study aimed to find out the relation of different grades of pterygium with corneal astigmatism. Eyes of 41 patients with unilateral pterygium of different grades were examined. best corrected visual acuity was measured using Snellen visual acuity chart. Sizes of pterygium was evaluated using slit-lamp, (pterygium was graded depending on the extent of corneal involvement) and keratometry was done to find the corneal astigmatism. Pterygium of grade I produces mild astigmatism (1.00 to 2.00 diopters) in 18 patients, grade â…¡ produces moderate astigmatism (2.00 to 4'00 diopters) in 12 patients. Severs astigmatism (>4.00 diopters) in only 3 patients, common grade of pterygium was grade â…  present in 61% (25) of patients. grade â…¡ in 31.7% (13) of patients, grade â…¢ in 7.3% (3) of patients. pterygiums induce 78% (32) of with the- rule astigmatism, 4.9% (2) of oblique astigmatism, 17.1% (7) of against the rule astigmatism. In majority of the patient’s common grade of pterygium was grade â…¡, and commonly produces mild astigmatism of 1.2D, and the grade increases degree of astigmatism also increases. Pterygium induces with the rule astigmatism and as the corneal involvement increases, degree of astigmatism also increases. Most of the pterygium patients working areas was outdoor and most of them were not using sunglasses or hat.

Keywords: Pterygium, Astigmatism, Corneal Topography, Visual Acuity.