[Pre-conditions of proliferative diabetic retinopathy (author's transl)]

From two groups of diabetics, i.e. an "invesitgation-group" of 40 cases and a "comparison-group" of 55 cases, the following characteristics of a state preliminary to proliferative diabetic retinopathy are resulting: early commencing of angiopathy by means of proteinuria (nephropathy), progression of retinopathy (pre-stage), pronounced progressiveness of the accompanying nephropathy and arterial hypertension, and finally uncommon diabetic heredo-familiarity. They all permit permature conclusion on proliferative retinopathy (and glomerulosclerosis).