Diabetic retinopathy (DR) classification used in our grading for DR screening based on UK guidelines6
| Grade of retinopathy | Description | Features | |
|---|---|---|---|
| Retinopathy | R0 | None | |
| R1 | Background | Micro aneurysms Retinal haemorrhages+any exudate | |
| R2 | Pre-proliferative | Venous beading Venous loop or reduplication Intraretinal microvascular abnormality (IRMA) Multiple deep, round or blot haemorrhages Cotton wool spots in addition to above features | |
| R3 | Proliferative | New vessels on disc (NVD) New vessels elsewhere (NVE) Preretinal or vitreous haemorrhage Extensive fibrovascular proliferation Pre-retinal fibrosis±tractional retinal detachment | |
| Maculopathy | M0 | No maculopathy | |
| M1 | Exudate within one disc diameter (DD) of centre of fovea Circinate or group of exudates within the macula Retinal thickening less than or equal to one DD of centre of fovea (if stereo available) Any microaneurysm or haemorrhage within one DD of centre of fovea only if VA (if no stereo) ≤6/12 | ||
| Photocoagulation | P | Focal or scatter laser scars | |
| Other lesions | OL | Other lesions such as non-diabetic lesions as age-related macular degeneration (AMD) | |
| Unclassifiable | U | Ungradable | Eg, if media opacity, poor view on photographs |