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Abstract #13071 Published in IGR 7-3
Prevalence and mechanism of appositional angle closure in acute primary angle closure after iridotomy
Yeung BY; Ng PW; Chiu TY; Tsang CW; Li FC; Chi CC; Lai JS; Tham CC; Lam DSClinical and Experimental Ophthalmology 2005; 33: 478-482
See also comment(s) by Minguang He •
PURPOSE: A prospective observational case series to assess the prevalence of appositional angle closure in darkness among iridotomized Chinese eyes after acute primary angle closure (APAC) with the use of both clinical methods and ultrasound biomicroscopy. METHODS: Sixteen Chinese patients who had history of APAC and subsequent successful treatment with laser peripheral iridotomy were examined. Fourteen additional control subjects were studied. Gonioscopy and ultrasound biomicroscopic examination were performed in the dark. Gonioscopic appearance of the angle was assessed, and quantitative measurements of the angle from the ultrasound biomicroscopic images were taken. RESULTS: Of the APAC eyes 55.6% had appositionally closed angle clinically and in 38.9% only Schwalbe's line was visible on gonioscopy. Ultrasound biomicroscopy confirmed structurally different anterior segments between eyes with APAC and the control eyes. In particular, the trabecular-ciliary-process distances were markedly different between the two groups. CONCLUSION: This study documented a high prevalence of appositional closure in iridotomized eyes after APAC in Chinese patients. The anteriorly positioned ciliary body, as documented in these cases by ultrasound biomicroscopy, is the likely mechanism of the angle crowding in this patient population.
Dr. B.Y. Yeung, Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, China. ymyeung@ha.org.hk
Classification:
9.3.1 Acute primary angle closure glaucoma (pupillary block) (Part of: 9 Clinical forms of glaucomas > 9.3 Primary angle closure glaucomas)