Bilal , Abdullah, Misbah Sattar, and Mahfar Khan. “Frequency Of Refractive Error in School Going Children Visiting Eye OPD With Complain of Headache and Eye Strain: Refractive Error in School Going Children”. Pakistan BioMedical Journal 5, no. 8 (August 31, 2022): 31–35. Accessed April 18, 2024. https://pakistanbmj.com/journal/index.php/pbmj/article/view/678.