Abnormal ratio of optic disc variables according to glaucomatous field defect
| Abnormal ratio, no (%) | |||
|---|---|---|---|
| Variables | Group I | Group II | Group III |
| Half depth area | 19/29 (65.5) | 14/19 (73.7) | 26/32 (81.25) |
| C/D ratio | 23/29 (79.3) | 19/19 (100) | 32/32 (100) |
| Total area of NRR | 22/29 (75.9) | 19/19 (100) | 32/32 (100) |
| Volume above | 15/29 (51.7) | 16/19 (84.2) | 23/32 (71.9) |
| Localised thinning of NRR | 19/29 (65.5) | 16/19 (84.2) | 31/32 (96.9) |
Group I = mild visual field loss (mean deviation better than –6 dB); Group II = moderate visual field loss (mean deviation –6 to –12 dB); Group III = severe visual field loss (mean deviation worse than –12 dB); C/D ratio = cup to disc ratio; NRR = neuroretinal rim.