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Abstract #14608 Published in IGR 8-4
Evaluation of the anterior chamber angle in Asian Indian eyes by ultrasound biomicroscopy and gonioscopy
Kaushik S; Jain R; Pandav S; Gupta AIndian Journal of Ophthalmology 2006; 54: 159-163
PURPOSE: To compare the ultrasound biomicroscopic measurement of the anterior chamber angle in Asian Indian eyes, with the angle width estimated by gonioscopy. MATERIALS AND METHODS: PARTICIPANTS: Patients with open and closed angles attending a glaucoma clinic were recruited for the study. OBSERVATION PROCEDURES: Temporal quadrants of the angles of patients were categorized by gonioscopy as Grade 0 to Grade 4, using Shaffer's classification. These angles were quantified by ultrasound biomicroscopy (UBM) using the following biometric characteristics: Angle opening distance at 250 μ (AOD 250) and 500 μ (AOD 500) from the scleral spur and trabecular meshwork-ciliary process distance (TCPD). The angles were further segregated as 'narrow angles' (Schaffer's Grade 2 or less) and 'open angles' (Schaffer's Grade 3 and 4). MAIN OUTCOME MEASURES: The UBM measurements were computed in each case and analyzed in relation to the gonioscopic angle evaluation. RESULTS: One hundred and sixty three eyes of 163 patients were analyzed. One hundred and six eyes had 'narrow angles' and 57 eyes had 'open angles' on gonioscopy. There was a significant difference among the mean UBM measurements of each angle grade estimated by gonioscopy (P < 0.001). The Pearson correlation coefficient between all UBM parameters and gonioscopy grades was significant at the 0.01 level. The mean AOD 250, AOD 500 and TCPD in narrow angles were 58±49 μ, 102±84 μ and 653±124 respectively, while it was 176±47 μ, 291±62 μ and 883±94 μ in eyes with open angles (P < 0.001) respectively. CONCLUSIONS: The angle width estimated by gonioscopy correlated significantly with the angle dimensions measured by UBM. Gonioscopy, though a subjective test, is a reliable method for estimation of the angle width.
Dr. S. Kaushik, Department of Ophthalmology, Postgraduate Institute of Medical Education and Research, Chandigarh - 160 012, India
Classification:
6.4 Gonioscopy (Part of: 6 Clinical examination methods)
6.12 Ultrasonography and ultrasound biomicroscopy (Part of: 6 Clinical examination methods)
