Table 2:
Characteristics of Extramacular Drusen
| Features of Extramacular Drusen | N (Col%) |
|---|---|
| Total | 4168 (100.0%) |
| Extramacular drusen | |
| Absent/Questionable | 429 (10.3%) |
| Definite, continuous with macular drusen | 2897 (69.5%) |
| Definite, separated from macular drusen | 727 (17.4%) |
| Reticular pseudodrusen only | 77 (1.8%) |
| Cuticular drusen only | 38 (0.9%) |
| Maximum extramacular drusen size | |
| Large | 1247 (34.4%) |
| Medium | 1448 (39.9%) |
| Small | 913 (25.1%) |
| Pattern of Extramacular Drusen in Superior Quadrant | |
| Absent/Questionable* | 892 (21.45) |
| Definite mixed | 36 (0.9%) |
| Definite, predominantly consolidated | 60 (1.4%) |
| Definite, predominantly discrete | 2671 (64.1%) |
| Missing | 509 (12.2%) |
| Pattern of Extramacular Drusen in Nasal Quadrant | |
| Absent/Questionable* | 1023 (24.5%) |
| Definite mixed | 22 (0.5%) |
| Definite, predominantly consolidated | 39 (0.9%) |
| Definite, predominantly discrete | 2598 (62.3%) |
| Missing | 486 (11.6%) |
| Pattern of Extramacular Drusen in Inferior Quadrant | |
| Absent/Questionable* | 1881 (40.0%) |
| Definite mixed | 11 (0.3%) |
| Definite, predominantly consolidated | 29 (0.7%) |
| Definite, predominantly discrete | 1807 (43.4%) |
| Missing | 656 (15.7%) |
| Pattern of Extramacular Drusen in Temporal Quadrant | |
| Absent/Questionable* | 544 (13.0%) |
| Definite mixed | 71(1.7%) |
| Definite, predominantly consolidated | 81 (1.9% |
| Definite, predominantly discrete | 3001 (72.0%) |
| Missing | 471 (11.3%) |
| Extramacular Drusen Area | |
| < O2 (<0.5mm2) | 2097 (50.3%) |
| < 1 DA (<2.54mm2 ) | 900 (21.6%) |
| >= 1 DA, < 3DA (2.54 – 7.62mm2) | 500 (12.0%) |
| >= 3DA (7.62mm2) | 105 (2.5%) |
| Missing | 566 (13.6%) |
| Pigmentary changes in Extramacular Region | |
| Absent/Questionable** | 3455 (82.9%) |
| Both hyper and hypo | 19 (0.5%) |
| Hyperpigmentation | 104 (2.5%) |
| Hypopigmentation | 23 (0.6%) |
| Missing | 567 (13.6%) |
| Baseline VA | |
| <20/200 | 32 (0.8%) |
| <20/40–20/200 | 394 (9.5%) |
| <20/20–20/40 | 2104 (50.5%) |
| 20/20+ | 1630 (39.1%) |
| Missing | 8 (0.2%) |
Missing includes eyes without extramacular drusen and ungradable eyes.
*
Absent/questionable indicates EMD present in the eye but not in the specific subfield
**
Absent/questionable indicates EMD present but no pigmentary changes DA = Disc Area