[Glycosylated hemoglobin and monitoring of diabetic retinopathy].

The value of glycosylated hemoglobin (HbA1) has been determined in diabetic patients with simple or proliferative retinopathy and in those without retinopathy. The mean value of HbA1 is significantly more highly elevated in patients with retinopathy than in those without retinopathy. Progressive augmentation of the value of HbA1 signifies a risk of deterioration of the retinopathy, whether it is a simple retinopathy or proliferative retinopathy.