Differences in optic disc parameters between the four groups
| Control | OHND | OHD | NTD | |
| Total contour area (mm2) | 2.248 (0.389) | 2.455 (0.654) | 2.600 (0.656) | 2.747 (0.699) |
| Effective area (mm2) | 0.870 (0.274) | 1.119 (0.578) | 1.371 (0.492) | 1.592 (0.456) |
| Neuroretinal rim area (mm2) | 1.352 (0.344) | 1.337 (0.367) | 1.234 (0.354) | 1.112 (0.398) |
| Half depth area (mm2) | 0.263 (0.126) | 0.352 (0.236) | 0.489 (0.263) | 0.695 (0.354) |
| C/D ratio | 0.386 (0.102) | 0.440 (0.145) | 0.519 (0.118) | 0.576 (0.064) |
| Mean contour depth (mm) | −0.006 (0.083) | −0.030 (0.079) | −0.080 (0.087) | −0.126 (0.067) |
| Volume below (mm3) | −0.175 (0.092) | −0.274 (0.204) | −0.376 (0.242) | −0.498 (0.212) |
| Maximum depth (mm) | −0.527 (0.169) | −0.609 (0.208) | −0.625 (0.315) | −0.692 (0.133) |
| Half depth volume (mm3) | −0.032 (0.022) | −0.046 (0.041) | −0.074 (0.061) | −0.107 (0.072) |
| Average depth (mm) | −0.130 (0.161) | −0.220 (0.079) | −0.257 (0.093) | −0.257 (0.093) |
| Contour variation | 0.326 (0.091) | 0.370 (0.241) | 0.373 (0.134) | 0.322 (0.096) |
| Contour tilt (°) | −4.430 (5.464) | −1.364 (6.134) | −3.409 (5.928) | −1.721 (5.368) |
Values are mean (SD).
C/D ratio = cup to disc ratio; OHND = ocular hypertension without glaucomatous disc change; OHD = ocular hypertension with glaucomatous disc change; NTD = normal tension with glaucomatous disc change.