Reproducibility of the optic topographic parameters measured using HRT
| Parameters | Coefficient of variation | ||||||
|---|---|---|---|---|---|---|---|
| Right | SD | Left | SD | ||||
| Coefficient of variation was obtained from measurement at three times over a 1 week period. | |||||||
| Disc area was defined in the first measurement, and transported to the second and third topographic images. | |||||||
| No significant differences between right and left eyes. | |||||||
| Each value represents mean (SD) for 18 eyes. RNFL, retinal nerve fibre layer | |||||||
| Cup area (mm2) | 23.3 | 24.8 | 24.2 | 28.2 | |||
| Cup/disc area ratio | 23.4 | 24.9 | 24.1 | 28.0 | |||
| Rim area (mm2) | 3.4 | 3.4 | 3.1 | 2.3 | |||
| Height variation contour (mm) | 7.0 | 4.1 | 7.1 | 3.8 | |||
| Cup volume (mm3) | 30.7 | 28.7 | 40.9 | 47.3 | |||
| Rim volume (mm3) | 8.3 | 4.7 | 8.0 | 4.8 | |||
| Mean cup depth (mm) | 7.0 | 4.1 | 8.1 | 7.1 | |||
| Maximum cup depth (mm) | 6.0 | 4.0 | 5.8 | 5.8 | |||
| Cup shape measure | 12.6 | 6.3 | 13.1 | 11.1 | |||
| Mean RNFL thickness (mm) | 7.1 | 5.3 | 7.2 | 4.2 | |||
| RNFL cross section area (mm2) | 7.1 | 5.3 | 7.1 | 4.2 | |||