Fig. 2From: Present and future screening programs for diabetic retinopathy: a narrative reviewTrends in the incidence of proliferative diabetic retinopathy in population-based studies of type 1α or 2 diabetesβ and some including both types of diabetesγ. The year marks the baseline date of each follow-up period and the uppercase number is the reference number. PDR proliferative diabetic retinopathyBack to article page