Diabetic retinopathy classification
| Grade | Signs |
|---|---|
| Non-proliferative | Retinal microaneurysms |
| Occasional blot haemorrhages | |
| Hard exudates | |
| Pre-proliferative | Venous beading |
| Large retinal blot haemorrhages | |
| Cotton wool spots | |
| Multiple intraretinal microvascular abnormalities | |
| Macular oedema | Retinal thickening within 2 disc diameters of centre of macula |
| Adjacent hard exudates if associated with retinal thickening | |
| Proliferative | Neovascularisation of the disc greater than 1/4 to 1/3 disc area |
| Vitreous or preretinal haemorrhage associated with neovascularisation | |
| Neovascularisation of the retina 1/2 of disc area or more in size |