Introduction: One of the microvascular complications of diabetes mellitus is a diabetic retinopathy which turns out to be the main reason of newly developed blindness in individuals of reproductive age in developed countries. Purpose: The aim of this study was to report a case of 23-years old patient which was provided with intensive therapy with the goal of achieving near-normal glycemia. Improved blood-glucose levels lead to inhibition and regression of diabetic retinopathy and improvement of visual acuity. Results: Improvement of best corrected visual acuity of both eyes (righteye 0.8, left eye 0.7) was achieved. We observed significant improvement in clinical manifestations of diabetic retinopathy including regression of microvasular abnormalities and considerable reduction of optic disc edema. Conclusions: Besides of invasive procedures such as laseroterapy, steroid or anti vascular endothelial growth factor injections and vitrecotmy, correct treatment of diabetes mellitus complications such as proliferative diabetic retinopathy should be mainly focused on maintaining normal blood-glucoselevels.