A 30 year old patient with history of recurrent headache was sent for fundus evaluation. He was found to be having generalized aerial attenuation with multiple cotton wool spots and flame shaped haemorrhages in both eyes. The most likely cause is -

B i.e. Duration of disease The presence & degree of diabetic retinopathy is more closely related to the duration of disease than to its severityQ. Duration of disease is the most impoant and best predictor Q of diabetic retinopathy. In diabetic retinopathy aeriolar changes consist of narrowing Q (not dilation) silver-wiring and obliteration resembling branch retinal aery occlusion. And venous changes are bending, looping and sausage like segmentation.