Table 2. Comparison of orbital MRI parameters of the two groups.
| MRI parameters | Normal IOP group (n=50, eyes) | High IOP group (n=20, eyes) | P value |
|---|---|---|---|
| Proptosis (mm) | 21.07±3.10 | 21.36±4.38 | 0.76 |
| EOM volume (cm3) | 3.18±0.78 | 4.13±1.04 | <0.001 |
| OF volume (cm3) | 6.89 (5.81, 9.31) | 8.54 (6.22, 9.65) | 0.26 |
| Orbit volume (cm3) | 11.05±3.24 | 12.57±3.19 | 0.08 |
| Axial ONA (deg) | 168.80±6.30 | 162.35±5.81 | 0.001 |
| Sagittal ONA (deg) | 170.31±5.76 | 166.19±4.88 | 0.02 |
| Horizontal gaze (deg) | 158.30±10.53 | 158.90±10.80 | 0.85 |
| Vertical gaze (deg) | 166.12±10.36 | 171.23±10.01 | 0.11 |
Data are presented as mean ± standard deviation or median (quartile). MRI, magnetic resonance imaging; IOP, intraocular pressure; EOM, extraocular muscle; OF, orbital fat; ONA, optic nerve angle; deg, degree.