| NSC |
International term |
American term |
Features |
| R0 |
No DR |
Grade 0 |
Normal retina |
| R1 |
Mild NPDR |
Grade 1 |
Retinal hemorrhages & microaneurysms |
| R2 |
Moderate NPDR |
Grade 2 |
Extensive microaneurysm, retinal hemorrhage, and hard exudates |
| R2 |
Severe NPDR |
Grade 3 |
Venous abnormalities, large blot hemorrhages, cotton wool spots, IRMA. |
| R3 |
PDR |
Grade 4a |
NVD or NVE |
| R3 |
Pre-retinal fibrosis ± tractional RD |
Grade 4b |
Fibrovascular proliferation,
RD, preretinal or vitreous hemorrhage, glaucoma |
| M0 |
No maculopathy |
|
No maculopathy |
| M1 |
Diabetic maculopathy |
|
Severe form:
- CSME
- Exudative form
- Ischemic form
Milder forms:
- Exudate ≤ 1DD of centre of fovea
- Circinate or group of exudates within macula
- Any microaneurysm or hemorrhage ≤ 1DD of centre of fovea only if associated with BCVA of ≤ 6/12
|
| P |
Photocoagulation |
Grade 4b |
Small retinal scars throughout the peripheral retina |