| Stage | Fundus Findings | Progress of Risk to Proliferative Retinopathy |
|---|---|---|
| Mild | Microaneurysms only | 6% at 5 years |
| Moderatge | Microaneurysms + hemorrhages, hard exudates, cotton wool spots, venous beading, or IRMA | 18% at 5 years |
| Severe | 4-2-1 rule (any of the following);hemorrhages in all 4 quadrants, venous beading in ≥2 quadrants, or prominent IRMA in ≥1 quadrant | 50% in 1 year |
| Very-Severe | Two or more of the Severe features above | 100% at 4 years in one series |