ALB and non-proliferative diabetic retinopathy: NPDR - non-proliferative diabetic retinopathy, PDR - proliferative diabetic retinopathy, DM - diabetes mellitus, BMI - body mass index, eGFR - estimated glomerular filtration rate, FBS - fasting blood sugar, PPBS - post-prandial blood glucose, HbA1c - glycated hemoglobin, UACR - urinary albumin to creatinine ratio, PUC - pre-university degree, OAD - oral antidiabetic medication