Level

Equivalent disease severity level

Clinical features

Retinopathy

R0

No retinopathy

R1

Mild and moderate non-proliferative diabetic retinopathy

Micro aneurysms; retinal haemorrhage or exudates not within the definition of maculopathy

R2

Severe non-proliferative diabetic retinopathy

Venous beading/loop/reduplication/Intra-retinal micro vascular abnormality, multiple deep, round or blot haemorrhage

R3

Proliferative diabetic retinopathy

New vessels disc or elsewhere

Maculopathy

M0

No maculopathy

M1

Exudate within 1-disc diameter of the center of the fovea; circinate or group of exudates within the macula; retinal thickening within 1-disc diameter center of the fovea; any micro aneurysm or haemorrhage 1-disc diameter center of the fovea only if associated with a best visual acuity of 6/12 or worse.

Photocoagulation

P0

No photocoagulation

P1

Evidence of focal or grid laser or peripheral scatter

Unclassifiable

U

Unobtainable/ungradable