Table 2
Measurements of the optic disc and intraocular pressure (mean (SD))
| Pigmentary glaucoma | Primary open angle glaucoma | p Value | Primary open angle glaucoma adjusted for refractive error and age | p Value | |
|---|---|---|---|---|---|
| n | 62 | 566 | 102 | ||
| Optic disc area (mm2) | 2.67 (0.79) | 2.69 (0.62) | 0.21 (ns) | 2.67 (0.72) | 0.55 (ns) |
| Min/max diameter | 0.87 (0.07) | 0.89 (0.07) | 0.007 | 0.89 (0.07) | 0.06 (ns) |
| Form factor | 0.97 (0.02) | 0.97 (0.06) | 0.84 (ns) | 0.97 (0.02) | 0.83 (ns) |
| Rim area (mm2): | |||||
| Total | 1.18 (0.48) | 1.16 (0.37) | 0.45 (ns) | 1.25 (0.39) | 0.35 (ns) |
| Temporal horizontal | 0.17 (0.09) | 0.17 (0.08) | 0.30 (ns) | 0.18 (0.08) | 0.95 (ns) |
| Temporal superior | 0.30 (0.15) | 0.29 (0.11) | 0.59 (ns) | 0.31 (0.12) | 0.67 (ns) |
| Temporal inferior | 0.29 (0.14) | 0.30 (0.12) | 0.64 (ns) | 0.34 (0.13) | 0.67 (ns) |
| Nasal | 0.44 (0.17) | 0.42 (0.13) | 0.31 (ns) | 0.45 (0.15) | 0.02 (ns) |
| Rim width (mm): | |||||
| Temporal | 0.20 (0.15) | 0.19 (0.10) | 0.33 (ns) | 0.20 (0.11) | 0.75 (ns) |
| Inferior | 0.26 (0.18) | 0.26 (0.13) | 0.48 (ns) | 0.29 (0.12) | 0.30 (ns) |
| Nasal | 0.29 (0.16) | 0.28 (0.11) | 0.18 (ns) | 0.30 (0.11) | 0.85 (ns) |
| Superior | 0.29 (0.19) | 0.26 (0.12) | 0.11 (ns) | 0.29 (0.14) | 0.81 (ns) |
| Cup/disc diameter ratios: | |||||
| Horizontal | 0.71 (0.16) | 0.73 (0.12) | 0.35 (ns) | 0.71 (0.14) | 0.76 (ns) |
| Vertical | 0.71 (0.17) | 0.73 (0.14) | 0.51 (ns) | 0.69 (0.15) | 0.34 (ns) |
| Horizontal/vertical | 1.00 (0.09) | 1.02 (0.11) | 0.47 (ns) | 1.03 (0.09) | 0.02 |
| Optic cup depth (relative units) | 2.4 (0.9) | 2.6 (0.9) | 0.08 (ns) | 2.5 (1.0) | 0.27 (ns) |
| Frequency of disc haemorrhages | 3.2% | 6.2% | >0.05 (ns) | 2.9% | >0.05 (ns) |
| Localised retinal nerve fibre layer defects | 16% | 22% | >0.05 (ns) | 19% | >0.05 (ns) |
| Alpha zone area (mm2): | |||||
| Total | 0.68 (0.57) | 0.72 (0.59) | 0.63 (ns) | 0.81 (0.60) | 0.19 (ns) |
| Temporal horizontal | 0.32 (0.26) | 0.33 (0.24) | 0.53 (ns) | 0.36 (0.25) | 0.20 (ns) |
| Temporal superior | 0.11 (0.11) | 0.15 (0.16) | 0.17 (ns) | 0.18 (0.20) | 0.06 (ns) |
| Temporal inferior | 0.18 (0.15) | 0.16 (0.18) | 0.20 (ns) | 0.17 (0.14) | 0.86 (ns) |
| Nasal | 0.07 (0.20) | 0.09 (0.18) | 0.20 (ns) | 0.10 (0.18) | 0.24 (ns) |
| Beta zone area (mm2): | |||||
| Total | 0.52 (0.71) | 0.60 (1.09) | 0.75 (ns) | 0.52 (0.77) | 0.77 (ns) |
| Temporal horizontal | 0.22 (0.25) | 0.21 (0.33) | 0.36 (ns) | 0.22 (0.16) | 0.94 (ns) |
| Temporal superior | 0.10 (0.25) | 0.11 (0.21) | 0.64 (ns) | 0.11 (0.20) | 0.46 (ns) |
| Temporal inferior | 0.17 (0.29) | 0.16 (0.31) | 0.38 (ns) | 0.13 (0.21) | 0.43 (ns) |
| Nasal | 0.04 (0.11) | 0.12 (0.39) | 0.30 (ns) | 0.07 (0.26) | 0.73 (ns) |
| Retinal vessel diameter (mm), arteriole: | |||||
| Temporal inferior | 0.093 (0.032) | 0.102 (0.029) | 0.19 (ns) | 0.103 (0.023) | 0.05 (ns) |
| Temporal superior | 0.098 (0.028) | 0.098 (0.024) | 0.59 (ns) | 0.101 (0.026) | 0.54 (ns) |
| Nasal superior | 0.091 (0.030) | 0.090 (0.024) | 0.31 (ns) | 0.095 (0.023) | 0.64 (ns) |
| Nasal inferior | 0.093 (0.031) | 0.091 (0.027) | 0.44 (ns) | 0.093 (0.024) | 0.15 (ns) |
| Venule: | |||||
| Temporal inferior | 0.127 (0.037) | 0.138 (0.033) | 0.09 (ns) | 0.139 (0.035) | 0.07 (ns) |
| Temporal superior | 0.131 (0.040) | 0.132 (0.032) | 0.62 (ns) | 0.133 (0.032) | 0.84 (ns) |
| Nasal superior | 0.113 (0.038) | 0.113 (0.033) | 0.75 (ns) | 0.111 (0.031) | 0.31 (ns) |
| Nasal inferior | 0.124 (0.035) | 0.113 (0.033) | 0.09 (ns) | 0.117 (0.031) | 0.88 (ns) |
| Perimetric loss variance value (dB2) | 19.97 (30.6) | 20.7 (24.99) | 0.34 (ns) | 16.2 (23.0) | 0.35 (ns) |
| Intraocular pressure (mm Hg): | |||||
| Mean maximal | 24.5 (6.6) | 21.2 (5.1) | <0.0001 | 22.0 (5.1) | 0.0008 |
| Mean minimal | 13.0 (2.8) | 13.2 (3.0) | 0.73 (ns) | 13.9 (3.0) | 0.10 (ns) |
| Amplitude | 11.5 (6.6) | 8.0 (5.2) | <0.0001 | 7.9 (5.3) | 0.0008 |
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p Value = significance of differences between the pigmentary glaucoma group and the primary open angle glaucoma group adjusted or not adjusted for age and refractive error; ns = statistically not significant.
