This study focuses on the changes of corneal astigmatism after and before pterygium surgery along with two different techniques of surgery (Bare sclera, Conjunctival autograft). Method: 50 patients having primary pterygium are included in the study that experienced excisional surgery by 2 methods-25 bare sclera and 25 CLAU. Every patient had been evaluated pre-operatively for anterior and posterior segments,visual acuity , autorefractokeratometry on day 5, day 30 and day 90 along with analysis of the results. In order to compare the level of probability, unpaired and paired t test were utilized. The probability level had been measured as 0.05 and considered as statistically significant. Results- After three months of surgery, the reduction can be seen in the mean of preoperative astigmatism from 3.45% + 1.72 Dioptres(D) to 1.05 + 0.74 Dioptres (D) and it was statistically important (p less than 0.0001). Changes had been exhibited by bare sclera and conjunctival autograft in accounting astigmatism to 1.80 + 0.82 D and 2.52 +1.23 D respectively. The surgery of Pterygium excision utilizing the conjunctival autograft had been more efficient than the excision of pterygium utilizing technique of bare sclera in the astigmatism reduction. Conclusion: Excision of Pterygium results in reduction of astigmatism notably that helps in the enhancement of the visual acuity. Conjunctival limbal autograft is a much better technique to perform surgery as compared to bare sclera for the reduction of astigmatism