Table 1. The baseline demographic and biometric characteristics.
| Parameters | Normal controls | PACS | P |
| Age (a) | 54.5±11.9 | 59.5±11.2 | 0.195 |
| Gender (M/F) | 4/15 | 8/11 | 0.495 |
| Eye (right/left) | 9/10 | 9/10 | 1.000 |
| AL (mm) | 23.21±1.10 | 22.60±0.61 | 0.042 |
| PD (mm) | 4.418±0. 851 | 3.466±0.798 | 0.001 |
| I-curv (mm) | 0.237±0.056 | 0.340±0.066 | <0.001 |
| IT750 (mm) | 0.473±0.037 | 0.444±0.072 | 0.129 |
| IT2000 (mm) | 0.560±0.043 | 0.449±0.054 | <0.001 |
| IS (mm2) | 1.685±0.139 | 1.804±0.227 | 0.060 |
| IV (mm3) | 43.13±2.60 | 43.33±5.77 | 0. 893 |
| AOD500 (mm) | 0.465±0.115 | 0.125±0.100 | <0.001 |
| CACD (mm) | 2.54±0.28 | 1.93±0.19 | <0.001 |
| PACD (mm) | 1.94±0.30 | 1.34±0.18 | <0.001 |
| ACV (mm3) | 120.8±27.2 | 72.9±15.3 | <0.001 |
| CCT (µm) | 550.7±32.1 | 533.9±27.7 | 0.092 |
| CV (mm3) | 61.5±3.7 | 59.7±3.7 | 0.123 |
| Km/front (D) | 44.1±1.6 | 44.0±1. 7 | 0. 846 |
| Km/back (D) | −6.5±0.2 | −6.5±0.2 | 0. 889 |
| Astig/front (D) | 0.95±0.72 | 0.87±0.67 | 0.746 |
| Astig/back (D) | 0.26±0.11 | 0.30±0.10 | 0.279 |
PACS: Primary angle closure suspects; AL: Axial length; PD: Pupil diameter; I-curv: Iris curvature; IT750/IT2000: Iris thickness at 750 µm/2000 µm; IS: Iris cross sectional area; IV: Iris volume; AOD500: Angle opening distance at 500 µm; CACD: Central anterior chamber depth; PACD: Peripheral anterior chamber depth; ACV: Anterior chamber volume; CCT: Central corneal thickness; CV: Central corneal volume; Km: Corneal keratometry; Astig: Corneal astigmatism. Values are given as mean±SD. P: Compare between normal controls and PACS. P is significant when <0.05.