TABLE 4.
The RNFL Tipping Point Values, Which are Associated With Initial Visual Field Damage, Are Shown as Absolute Values and as Percentage Tissue Decrease, as Measured by Spectral-domain Optical Coherence Tomography
| Anatomic Region | RNFL Tipping Point [95% CI] (μm) | Mean RNFL Thickness of Normal (μm) | RNFL Tipping Point Relative to Mean RNFL Thickness of Normal (%) | MDB Tipping Point Relative to Mean MDB Thickness of Normal (%) |
|---|---|---|---|---|
| Global | 69.6 [59.5, 79.6] | 94.8±12.1 | 26.6 | 31.0 |
| Superior | 82.0 [71.4, 92.6] | 114.3±20.3 | 28.2 | 36.8 |
| Inferior | 72.0 [62.0, 82.0] | 123.4±19.6 | 41.7 | 43.6 |
| Nasal | 58.0 [38.2, 77.8] | 71.0±14.0 | 18.3* | 29.6 |
| Temporal | 49.0 [42.8, 55.2] | 70.0±14.0 | 30.0 | 32.1 |
| Superior-nasal | 62.0 [52.4, 71.6] | 99.4±22.9 | 37.6 | 32.3 |
| Superior-temporal | 97.8 [77.6, 118.0] | 129.4±23.5 | 24.4 | 39.1 |
| Inferior-nasal | 81.0 [69.0, 93.0] | 108.3±27.1 | 25.2 | 35.1 |
| Inferior-temporal | 77.1 [64.1, 90.0] | 138.8±23.3 | 44.5 | 38.2 |
Results are expressed as means±SD, unless otherwise stated.
*Tipping point not significant.
CI indicates confidence interval; MDB, minimum distance band; RNFL, retinal nerve fiber layer.