It exists a book entitled The Effect of Hypolipidemic Drugs [hypolipidemic drug] on Diabetic Retinopathy [diabetic retinopathy]. Unfortunately I cannot remember the name of its author. It's a very interesting book which talks about hypolipidemic drugs and other treatments of this illness. So, I'm sure that it also talks about heparinoids, anabolic steroids and vitamins. Heparinoids, which are anticoagulants, are used to avoid hemorrhages in diabetic retinopathy.