The global prevalence of diabetes in 2015 was 415 million, and it is estimated to rise to 642 million by 2040.[2] 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.[3] 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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