Singh, H. ., V. K. . Saini, A. . Yadav, and B. . Soni. “Refractive Errors in School Going Children – Data from A School Screening Survey Programme”. National Journal of Community Medicine, vol. 4, no. 01, Mar. 2013, pp. 137-40, https://www.njcmindia.com/index.php/file/article/view/1478.