Table 8.
Definitions of Scale Steps
| Step | Drusen Area | Increased Pigment | Depigmentation-GA | |
|---|---|---|---|---|
| 1 | <C-1 | 0 | 0 | |
| 2 | ≥C-1, <C-2 | 0 | 0 | |
| <C-1 | ≥Q | and/or | ≥Q, <I-2 | |
| 3 | ≥C-2, <I-2 | 0 | 0 | |
| 4 | I-2, <O-2 | 0 | 0 | |
| ≥C-1, <I-2 | ≥Q | and/or | ≥Q, <I-2 | |
| <C-2 | ≥0 | ≥I-2, <0.5 DA | ||
| 5 | ≥O-2, <0.5 DA | 0 | 0 | |
| ≥I-2, <O-2 | ≥Q | ≥Q, <I-2 | ||
| ≥C-2, <I-2 | ≥0 | and/or | ≥I-2, <0.5 DA | |
| 6 | ≥0.5 DA | 0 | 0 | |
| ≥O-2, <0.5 DA | ≥Q | and/or | ≥Q, <I-2 | |
| ≥I-2, <O-2 | ≥0 | ≥I-2, <0.5 DA | ||
| 7 | ≥0.5 DA | ≥Q | and/or | ≥Q, <I-2 |
| ≥O-2, <0.5 DA | ≥0 | ≥I-2, <0.5 DA | ||
| 8 | ≥0.5 DA | ≥0 | ≥I-2, <0.5 DA | |
| Any | ≥0 | ≥0.5 DA | ||
| 9 | Any | ≥0 | Noncentral GA |
Abbreviations: DA, disc area; GA, geographic atrophy.