Kesesuaian Hasil Pengukuran Sudut Bilik Mata Depan antara Pentacam dan Ultrasound Biomicroscopy

Abstract

The assessment of anterior segment, especially the examination of anterior chamber angle, plays an important role in diagnosing and managing glaucoma. Pentacam and ultrasound biomicroscopy (UBM) were able to measure the anterior chamber angle quantitatively and objectively; however, UBM examination is invasive, where as Pentacam is without contact with eye globe surface. The aim of this study was to seek the conformation between Pentacam and UBM in measuring the anterior chamber angle. The study was analytic descriptive study with the agreement of both measurements in 42 eyes of 31 patients with glaucoma and non-glaucoma Cicendo Eye Hospital Bandung, in period of November to December 2010. The examination used both instruments in nasal and temporal area of anterior chamber angle with equal illumination. The agreement test using Bland and Altman and hypothesis using paired t-test. Statistically, there were no significant differences in anterior chamber open angle of nasal and temporal area between using Pentacam (37.51; 40.49; p=0.55) and UBM (38.87; 40.76; p=0.22), while the limit of agreement indicated wide range in nasal area (11.94 to -18.14) and in temporal area (11.51 to -15.31) in 95% confidence interval. In closed angle of anterior chamber, there was a significant difference at nasal and temporal area between using Pentacam (27.33; 35.65; p<0.001) and using UBM (31.47; 37.34; p<0.001), while the limit of agreement showed (4.01 to -16.65) for nasal area (2.98 to -14.73) for temporal area in 95% confidence interval. In conclusion, the measurement of the anterior chamber in open-angle group using Pentacam indicated poor agreement with using UBM; and there is no agreement in closed angle group.

Keywords

• Anterior chamber angle
• glaucoma
• Pentacam
• ultrasound biomicroscopy