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Objective: To investigate the deterministic values of angle recess area (ARA), angle opening distances at the locations 250 μm (AOD250) and 500 μm (AOD500) anterior to the scleral spur and trabecular-iris angle (TIA) in patients with open angle undergoing cataract surgery. Material and Methods: Thirty-three eyes of 33 patients with open angle undergoing cataract surgery were enrolled in this study. Ultrasound biomicroscopy (UBM) examination was performed preoperatively and 1 month postoperatively under a standard protocol. At each examination, radial sections of the angle at four quadrants were obtained. The images were analyzed using UBM Pro 2000 software for AOD and ARA semiautomatically, and for TIA manually. Results: The postoperative increases in the ARA, TIA, AOD250 and AOD500 were statistically significant at four quadrants (p<0.0001). The average increase in the ARA was 0.064±0.037 mm2 (44%), in the AOD250 was 0.056±0.02 mm (70%), in the AOD500 was 0.074±0.03 mm (56%) and in the TIA was 12.3±4.8o (52%). We determined statistically significant correlations between changes in the ARA with AOD250 (r=0.54, p=0.001) and AOD500 (r=0.74, p=0.0001). The lowest extraction value was AOD250 and the highest extraction value was AOD500 in three quadrants. Differently, the highest extraction value was determined as ARA at the nasal quadrant. Conclusion: Our study showed that AOD500 is as valuable as ARA in patients with open angle in the quantitative evaluation of the angle. This may not be the case in closed or occludable angles. AOD can be used reliably for the evaluation of the angle by the observers having UBM models without image analysis software.

The Deterministic Values of Angle Parameters Measured by Ultrasound Biomicroscopy in Patients with Open Angle After Cataract Surgery