Retinopathy severity grading scale14 37
| Level | Definition |
|---|---|
| Level 10 | No retinopathy/MA and all other lesions absent. |
| Level 20 | Minimal/mild non-proliferative retinopathy: |
| MAs only, or small retinal dot haemorrhages indistinguishable from MAs only; H/MA <SP1; with or without lipid exudates. | |
| Level 30 | Moderate non-proliferative retinopathy: |
| H/MAs ⩾SP2A in only one field; or H/MAs <SP 2A with IRMA, and/or RMI both <SP 8A; VB ⩽SP6A, or >SP6A in only one vein. | |
| Level 40 | Severe non-proliferative retinopathy: |
| H/MAs ⩾SP 2A in both fields, or if only in one field with IRMA or RMI both ⩾SP 8A; or VB >SP 6A in two veins or more. | |
| Level 50 | Inactive/quiescent proliferative retinopathy: |
| No evidence of active new vessels cut some retinopathy changes of level 20–30 changes possible as well as fibrous proliferation with photocoagulation scars either in scatter or confluent patches (panretinal photocoagulation). | |
| Level 60 | Active proliferative retinopathy: |
| New vessels on the disc and/or the retina with or without scars of photocoagulation. |
MA=microaneurysm; H=haemorrhage; SP=standard photograph (ETDRS)37; RMI=retinal microinfarct; IRMA= intraretinal microvascular abnormalities; VB=venous beading.