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Yes, pterygium surgery can reduce astigmatism caused by the growth changing the cornea's shape. In a surgical study, average corneal astigmatism fell from 3.47 diopters (D), units of focusing power, before removal to 1.10 D three months afterward. These averages don't mean that surgery eliminates all astigmatism or produces the same result for every patient.
read more about pterygium ...A pterygium can pull on the cornea and change its curvature, causing astigmatism. The cornea is the clear window at the front of your eye, and changes in its shape can reduce the sharpness of your vision. The growth extends from the tissue covering the white of the eye onto the cornea. Its effect on vision can involve changes in corneal shape as well as obstruction if it reaches the center.
Larger pterygia generally have a greater effect on corneal astigmatism. Measurements from 136 eyes undergoing removal showed an association between the growth's size and the amount of astigmatism before surgery. Larger growths also had an association with larger changes in astigmatism after removal. This pattern describes the eyes examined, so size alone doesn't tell you exactly how much your own measurements will change.
Average astigmatism decreased during follow-up after surgery in a group of 71 patients. Measurements averaged 2.13 D five days after removal and 1.20 D one month afterward. These figures describe the same surgical group as the three-month result above. They show changes at scheduled visits, rather than the exact day each patient's vision improved or the point when every patient's cornea stopped changing.
No, pterygium size can't precisely predict how much your astigmatism will change after surgery. The relationship between size and changes in corneal measurements doesn't amount to a reliable personal forecast. The surgical averages also have limits: the analysis excluded patients whose growth returned, and other patients didn't complete follow-up. That makes the reported improvement an incomplete picture of outcomes for everyone who initially entered that study.
No, eye drops don't remove the growth. Artificial tears and lubricating ointment can ease irritation, while removal requires surgery.
Yes, pterygium has an association with an unstable tear film and dry eye symptoms. Tear-film measurements can improve after removal, but the available findings don't establish that surgery will resolve every patient's dryness.
Yes, a pterygium can grow back after surgery. Surgical techniques that cover the removal site with a tissue graft can lower recurrence compared with leaving that area uncovered.
Arrange an eye exam if a pterygium seems to be growing, your vision becomes less clear, or irritation continues. An eye care professional can examine and measure the growth to track changes. An ophthalmologist can assess whether removal is appropriate when the growth threatens central vision or treatment doesn't control inflammation.
Cochrane Database of Systematic Reviews. Conjunctival autograft for pterygium. https://pubmed.ncbi.nlm.nih.gov/26867004/. Published February 11, 2016. Accessed November 3, 2026.
College of Optometrists. Pterygium. https://www.college-optometrists.org/clinical-guidance/clinical-management-guidelines/pterygium. Updated June 5, 2026. Accessed November 3, 2026.
Cornea. Systematic Review: Effects of Pterygium and Pingueculum on the Ocular Surface and Efficacy of Surgical Excision. https://pubmed.ncbi.nlm.nih.gov/33156079/. Published February 1, 2021. Accessed November 3, 2026.
Indian Journal of Ophthalmology. A comparative study of preoperative and postoperative changes in corneal astigmatism after pterygium excision by different techniques. https://pmc.ncbi.nlm.nih.gov/articles/PMC6611242/. Published July 2019. Accessed November 3, 2026.
Ophthalmology. Effects of pterygium on corneal spherical power and astigmatism. https://pubmed.ncbi.nlm.nih.gov/10919910/. Published August 2000. Accessed November 3, 2026.