Table 2 The Definitions of the Low- and High-risk R2 grade based on ETDRS studies.
From: Updates in the English Diabetic Eye Screening Programme
Lower risk (R2 L) is defined as the presence of ANY of the following features: |
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• 8 or more blot haemorrhages across the two digital 45 ° photographs • More than 20 intraretinal haemorrhages or microaneurysms located in 1,2 or 3 (but not all 4) of the four quadrants of the retina • Venous beading in 1 quadrant • Any quantity of IRMA less than ETDRS Standard photograph 8a* (see image below) |
Higher risk (R2H) is defined as the presence of ANY of the following features: 4-2-1 rule |
• More than 20 intraretinal haemorrhages or microaneurysms in EACH of the four quadrants of the retina (see image below). • Venous beading present in two or more quadrants • Moderate IRMA equal to or worse than the Airlie House ETDRS Standard photograph 8a in one or more quadrants* Please see Fig. 1 for examples of images. * ETDRS Standard photograph 8a standard photograph shows multiple patches of moderate IRMA, and it is the severity and quantity of IRMA present within 1 quadrant that should be assessed to determine if there are equal to or greater levels of IRMA present within 1 quadrant. Only IRMAs that are definitely seen on colour imaging should be classified as R2. |
