Ultrasound Biomicroscopic Features Associated with Angle Closure in Fellow Eyes of Acute Primary Angle Closure after Laser Iridotomy
In: Ophthalmology, Jg. 116 (2009-03-01), Heft 3, S. 444-448
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Zugriff:
Purpose: To investigate the frequency of appositional angle closure and related anatomic characteristics in fellow eyes of Chinese subjects with acute primary angle closure (APAC) after laser peripheral iridotomy (LPI). Design: Cross-sectional study. Participants: Consecutive subjects with APAC presenting from April 2006 to September 2006 at the Glaucoma Service of Peking University Eye Center, Peking University Third Hospital. Methods: Under dark conditions, fellow eyes were divided into 2 groups based on the detection of appositional angle closure by ultrasound biomicroscopy (UBM). For all subjects, UBM parameters were measured to evaluate the different anatomic features between the 2 groups. Darkroom provocative tests (DRPTs) and gonioscopy were performed to investigate the relationship between angle closure and intraocular pressure. Main Outcome Measures: Central anterior chamber depth (ACD); angle opening distance500 (AOD500); angle recess area750 (ARA750); trabecular-iris angle (T-I angle); trabecular-ciliary process distance (TCPD); peripheral iris thickness (IT1); iris-zonule distance (IZD); and the position of the iris insertion. Results: Thirty-four post-LPI fellow eyes of 34 patients with APAC (8 men, 26 women; mean ± standard deviation age 66.3±7.2 years, range 54–83) were included. Peripheral anterior synechiae (PAS) were not observed in any subject. Appositional angle closure was observed in at least 1 quadrant in 13 (38.2%) of the 34 patients. Compared with eyes without appositional closure, eyes with appositional closure showed significantly lower AOD500, ARA750, and T-I angle in 4 quadrants; shorter TCPD in the inferior and temporal quadrants; and thicker IT1 in the superior and nasal quadrants (P<0.05). The DRPT results were positive in 3 (11.1%) of 27 eyes with appositional closure in 0 to 2 quadrants and in 3 (75.0%) of 4 eyes with appositional closure in 3 to 4 quadrants (P = 0.0164). Conclusions: Under dark conditions, more than one third of fellow eyes of APAC showed appositional angle closure after LPI. The anatomic findings indicate a narrower angle, a more anterior position of the ciliary body, and a thicker peripheral iris in fellow eyes of APAC after LPI may be associated with an increased risk for progressive angle closure. Financial Disclosure(s): The author(s) have no proprietary or commercial interest in any materials discussed in this article. [Copyright &y& Elsevier]
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Ultrasound Biomicroscopic Features Associated with Angle Closure in Fellow Eyes of Acute Primary Angle Closure after Laser Iridotomy
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Autor/in / Beteiligte Person: | Yao, Bao-qun ; Wu, Ling-ling ; Zhang, Chun ; Wang, Xin |
Zeitschrift: | Ophthalmology, Jg. 116 (2009-03-01), Heft 3, S. 444-448 |
Veröffentlichung: | 2009 |
Medientyp: | academicJournal |
ISSN: | 0161-6420 (print) |
DOI: | 10.1016/j.ophtha.2008.10.019 |
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