Sultan, Sharjeel, et al. “Association of Dry Eye Disease and Diabetic Retinopathy With Glycated Hemoglobin at a Tertiary Care Unit of Karachi Pakistan”. Journal of Liaquat University of Medical & Health Sciences, vol. 22, no. 02, June 2023, pp. 104-9, http://121.52.154.205/index.php/jlumhs/article/view/946.