Diabetic retinopathy

Diabetic retinopathy is a condition that affects the retinal blood vessels in patients with diabetes mellitus. It can be classified into:

• Background diabetic retinopathy
• Preproliferative diabetic retinopathy
• Proliferative diabetic retinopathy
• Diabetic macular edema

Background and preproliferative diabetic retinopathy are also referred to as nonproliferative diabetic retinopathy.