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Table 1 Diabetic retinopathy disease severity scale according to the Early Treatment Diabetic Retinopathy Study (ETDRS)

From: Effect of diabetic retinopathy and diabetes on the intraocular straylight in pseudophakic eyes

Mild non-proliferative diabetic retinopathy  
Microaneurysms only  
Moderate non-proliferative diabetic retinopathy  
More than just microaneurysms but less than severe non-proliferative diabetic retinopathy  
Severe non-proliferative diabetic retinopathy  
Any of the following:  
More than 20 intraretinal hemorrhages in each of four quadrants  
Definite venous beading in more than two quadrants  
Prominent intraretinal microvascular abnormalities in more than one quadrant and no signs of proliferative retinopathy