Table 1.
Classification of Early and Late AMD by the International Classification and Grading System for Age-Related Macular Degeneration
|
Group |
Description |
| 0 | |
| a | No signs |
| b | Few hard drusen (<63 μm) |
| 1 | |
| a | Soft distinct (>63 μm) |
| b | Pigment irregularities only (no soft drusen) |
| 2 | |
| a | Soft indistinct drusen (>125 μm) |
| b | Soft distinct drusen (>63 μm) and pigment irregularities |
| 3 | Soft indistinct drusen (>125 μm) and pigment irregularities |
| 4 | |
| a | GA |
| b | CNV |
| c | GA and CNV |
Early-stage AMD includes Groups 0b, 1, 2, and 3, whereas late stage is Group 4.