The global prevalence of diabetes in 2015 was 415 million, and it is estimated to rise to 642 million by 2040. Among individuals with diabetes, one analysis of global prevalence found that 35% have some type of diabetic retinopathy, 7% have proliferative retinopathy, 7% have macular oedema, and 10% have vision-threatening retinopathy. All prevalences were greater in patients with type 1 diabetes compared with type 2, and increased with diabetes duration, poor glycaemic control, and poor blood pressure control.
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