Table 2.
Topographic extent of abnormalities of spectral domain optical coherence tomography.
| Variables | Total (N = 166) | Foveal centre involveda | Foveal centre not involved | ||||||
|---|---|---|---|---|---|---|---|---|---|
| All | Only center | Temporalb | Nasalb | Temporal and nasal | All | Temporal | Nasal | ||
| IR hyporeflective cavities | 121 (72.9) | 111 (91.7) | 42 (37.8) | 25 (22.5) | 6 (5.4) | 38 (34.2) | 10 (8.3) | 4 (40.0) | 6 (60.0) |
| OR hyporeflective cavities (above ELM) | 56 (33.7) | 40 (71.4) | 14 (35.0) | 16 (40.0) | 0 (0) | 10 (25.0) | 15 (26.8) | 13 (86.7) | 2 (15.4) |
| OR hyporeflective cavities (below ELM) | 52 (31.3) | 50 (96.2) | 37 (74.0) | 9 (18.0) | 0 (0) | 4 (8.0) | 2 (4.0) | 2 (100) | 0 (0) |
| Collapsing outer retinal layers | 45 (27.1) | 29 (64.4) | – | 17 (58.6) | 0 (0) | 12 (41.4) | 16 (35.6) | 16 (100) | 0 (0) |
| Disorganization of IR layers | 52 (31.3) | 31 (59.6) | – | 24 (77.4) | 0 (0) | 7 (22.6) | 21 (38.5) | 21 (100) | 0 (0) |
| ELM disruption | 67 (40.4) | 58 (86.6) | 11 (19.0) | 29 (50.0) | 0 (0) | 18 (31.0) | 9 (13.4) | 9 (100) | 0 (0) |
| EZ disruption | 87 (52.4) | 79 (90.8) | 27 (34.2) | 34 (43.0) | 0 (0) | 18 (22.8) | 8 (9.2) | 8 (100) | 0 (0) |
| IDZ disruption | 94 (56.6) | 88 (93.6) | 34 (38.6) | 35 (39.8) | 0 (0) | 19 (21.6) | 6 (6.4) | 6 (100) | 0 (0) |
Data are expressed as number (%).
ELM external limiting membrane, EZ ellipsoid zone, IDZ interdigitation zone, IR inner retinal, OR outer retinal.
aFoveal centre involvement was defined as abnormalities located within the foveal floor without the inner retinal layers or less than about 300–600 μm from the foveolar centre.
bThe nasal side and the temporal side of fovea were classified depending on the relative position to the foveolar centre.