Evaluation of changes in the keratometric values after pterygium excision with conjunctival autografting in different grades of pterygium

Abstract

To study the changes in keratometric values after pterygium excision with conjunctival autograft in different grades of pterygium. A retrospective, comparative study was done on 75 patients of various grades of pterygium who underwent excision surgery with conjunctival autograft. Preoperative and postoperative details of all the patients on 1, 7 and 30 day were taken into account including detailed ocular examination, best-corrected visual acuity, slit-lamp biomicroscopic examination, keratometric details and posterior segment examination. Net astigmatism was calculated preoperatively and on post-op examinations. Mean of difference in preoperative and post operative net astigmatism is calculated and compared in different grades of pterygium. Our study showed that there are significant changes in net astigmatism after pterygium excision mainly in grade 3 pterygium. Difference in mean net astigmatism at the end of 1 month from preoperative values was 2.39±0.73 in Group C, 1.45±0.5 in Group B and 0.49±0.24 in group C and this difference is significant. The amount of keratometric astigmatism is proportional to grades of pterygium (size of pterygium) and pterygium excision reduces the induced astigmatism and it varies according to grades.