Fundus groups specifications
| No or mild vascular retinopathy | Moderate vascular retinopathy | Vascular retinopathy with vessel rarefaction | |
| Arteriolar narrowing | Absent or age-related | Mild to moderate narrowing | Severe narrowing |
| Arteriovenous nicking | Absent or age-related | Sporadically | Various nickings |
| Rarefaction of arterioles and venules | Absent | Absent | Significant rarefaction |