Background: Pterygium is a degenerative condition of the subconjunctival tissue, which proliferates as vascularised granulation tissue to invade the cornea, destroying the superficial layer of the stroma and bowman's membrane. As the pterygium advances induced irregular astigmatism can cause decreased visual acuity. Purpose: To compare changes in visual acuity and refractive astigmatism before & after pterygium excision followed by sutureless glueless conjunctival limbal autograft and assess amount of induced corneal astigmatism in different grades of pterygium. Methods: The prospective, comparative study was carried out on 100 primary Pterygium patients. Visual acuity & refractive astigmatism was assessed pre-operatively & post operatively on 1st day, 7th day and 1 month. Pterygium excision followed by sutureless & glueless conjunctival autograft was the surgical technique used. Results: The preoperative mean keratometric astigmatism of 0.825D was reduced to 0.20D postoperatively at 1 month. It was statistically significant (P < 0.0001) .The preoperative mean refractive astigmatism value was more in grade 4 preoperatively 2.5D which decreased to 0.58D postoperatively, followed by grade3 pterygium which had preoperative mean astigmatic value 2.04 D reduced to 0.56D postoperatively. Conclusions: The present study concludes that reduction in refractive astigmatism occurs after pterygium excision followed by sutureless and glueless conjunctival autograft with improvement in visual acuity with additional benefit of lowest recurrence rate. There is directly proportional relation between pterygium grade and the amount of induced astigmatism.