Plateau iris in Asian subjects with primary angle closure glaucoma.

Full Abstract

OBJECTIVE: To determine the prevalence of plateau iris in Asian eyes with primary angle closure glaucoma (PACG) using ultrasound biomicroscopy (UBM). METHODS: In this cross-sectional observational study, subjects older than 40 years with PACG who had a patent laser peripheral iridotomy underwent UBM in 1 eye. Ultrasound biomicroscopy images were qualitatively analyzed using standardized criteria. Plateau iris in a quadrant was defined by anteriorly directed ciliary body, absent ciliary sulcus, steep iris root from its point of insertion followed by a downward angulation, flat iris plane, and irido-angle contact. At least 2 quadrants had to fulfill these UBM criteria for an eye to be classified as having plateau iris. RESULTS: One hundred eleven subjects (70 from Singapore, 41 from Thailand) with PACG were recruited. The mean (SD) age was 65.6 (8.1) years, and 63.9% were female. Based on standardized UBM criteria, plateau iris was found in 36 of 111 eyes (32.4%; 95% confidence interval, 24.4%-41.6%). In these 36 eyes, quadrant-wise analysis showed 66.7% had plateau iris in 2 quadrants; 22.2%, in 3 quadrants; and 11.1%, in all quadrants. CONCLUSIONS: About 30% of PACG eyes with a patent laser peripheral iridotomy were found to have plateau iris on UBM, highlighting the importance of non-pupil block mechanisms in Asian individuals.

Author information

Author/s: Kumar, Rajesh S (RS); Tantisevi, Visanee (V); Wong, Melissa H (MH); Laohapojanart, Kobkuea (K); Chansanti, Orathai (O); Quek, Desmond T (DT); Koh, Victor T (VT); MohanRam, Lakshmana S (LS); Lee, Kelvin Y (KY); Rojanapongpun, Prin (P); Aung, Tin (T);

Affiliation: Singapore National Eye Centre and Singapore Eye Research Institute, Singapore.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Archives of ophthalmology (Arch Ophthalmol), published in United States. (Language: eng)

Reference: 2009-Oct; vol 127 (issue 10) : pp 1269-72

Dates: Created 2009/10/13; Completed 2009/11/02;

PMID: 19822841, status: MEDLINE (last retrieval date: 11/2/2009, IMS Date: )

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