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 |