Ajeet Kumar1, Syeda Urooj Riaz2, Dileep Kumar3, Asad Raza Jafri4, Muhammad Ishaq5, Sehar Raza6, Mehjabeen Yaseen7. “EFFECT OF DURATION OF DIABETES MELLITUS AS A SIGNIFICANT MARKER FOR DIABETIC RETINOPATHY”. Journal of Peoples University of Medical &Amp; Health Sciences Nawabshah. (JPUMHS), vol. 10, no. 4, Dec. 2020, pp. 81-84, http://publication.pumhs.edu.pk/index.php/ojs/article/view/91.