Khan, Bilal, Ahmed Sohail, Tallat Anwar Faridi, Ubaidullah Jan, Fatima Zahid, and Ishrat Parveen. “Relation Between Different Grades of Pterygium and Amount of Induced Corneal Astigmatism: Different Grades of Pterygium”. Pakistan BioMedical Journal 4, no. 2 (October 14, 2021): 59–63. Accessed April 29, 2024. https://www.pakistanbmj.com/journal/index.php/pbmj/article/view/74.