Abstract
Purpose:
To compare the changes in the iridoangle in the eyes of subjects between plateau iris configurations and relative pupillary block.
Methods:
A total of 18 eyes (nine eyes with plateau iris configurations: P group, nine eyes with relative pupillary block: B group), that had undergone cataract surgery at Hiroshima University in Japan, from January to August 2013, were included in this study. Anterior segment optical coherence tomography (As-OCT), gonioscopy and ultrasound biomicroscopy (UBM) were performed for the diagnosis. The main outcome measure was the average angle in the area of the temporal and nasal horizontal (TIA500) and the anterior chamber depth (ACD).
Results:
The mean ACD before cataract surgery was 2.3±0.36 mm (P group) and 2.0±0.26 mm (B group). There were no significant differences in the ACD before the operation between the two groups (P=0.12). One week after the operation, the mean ACD was larger than that before the operation in both groups (B group: P<0.001, P group: P=0.002; Wilcoxon signed-rank test). Moreover, the ACD in the patients in the P group was larger than that in the B group after the operation (P group: 3.6±0.15 mm, B group: 3.2±0.28 mm; P=0.004). The mean TIA500 before cataract surgery was 17.3± 8.5°(P group) and 13.9± 5.0°(B group). One week after the operation, the mean TIA500 was larger than that before the operation in both groups (P group: 38.2±8.2°, B group: 36.3±7.2°; B group: P=0.002, P group: P=0.002; Wilcoxon signed-rank test). There were no significant differences in the TIA500 before or after the operation between the groups (P=0.62).
Conclusions:
In cases with the plateau iris configuration, cataract surgery led to a significantly larger increase in the anterior chamber depth compared to cases with relative pupillary block.