Table 1

 Levels of retinopathy according to the Scottish Diabetic Retinopathy Grading Scheme 2003

RetinopathyDescriptionOutcome
AH*, Airlie house standard photographs.14
R0No diabetic retinopathy anywhereRe-screen in 12 months
R1 (mild)Background diabetic retinopathy (BDR), mildRe-screen in 12 months
At least one dot haemorrhage or microaneurysm with or without hard exudates
R2 (moderate)BDR, moderate Four or more blot haemorrhages (ie, ⩾AH* standard photograph 2a) in one hemifield only. (Inferior and superior hemifields are delineated by a line passing through the centre of the fovea and the optic disc)Re-screen in 6 months (or refer to ophthalmology if this is not feasible)
R3 (severe)BDR, severeRefer to ophthalmology
Any of the following features
Four or more blot haemorrhages (ie, ⩾AH* standard photograph 2a) in both inferior and superior hemifields
Venous beading (ie, ⩾AH* standard photograph 6a)
IRMA (ie, ⩾AH* standard photograph 8a)
R4 (proliferative)Proliferative diabetic retinopathyRefer to ophthalmology
PDR
Any of the following features
New vessel
Vitreous haemorrhage
R5 (enucleated)Enucleated eyeRe-screen 12 months
(other eye)
R6Not adequately visualisedTechnical failure