Fischer F
Klin Monbl Augenheilkd. 1976 Feb;168(02):186-9.
From investigations of 141 patients, diabetic since childhood, diabetic retinopathy (angiopathy), shows strikingly contrasting forms of progress: (a) thoroughly benign (retinopathia simplex; partly regressive); (b) malign (retinopathia proliferans and glomerulosclerosis). The tendency to progression of diabetic retino- and angiopathy appears to be hereditarily determined and is modified, later, only to a certain extent by environmental factors.