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Abstract #26308 Published in IGR 12-3
Ultrasound biomicroscopic configurations of the anterior ocular segment in a population-based study the kumejima study
Henzan IM; Tomidokoro A; Uejo C; Sakai H; Sawaguchi S; Iwase A; Araie MOphthalmology 2010; 117: 1720-1728
PURPOSE: To characterize quantitatively the configuration of the anterior ocular segment with ultrasound biomicroscopy (UBM) in a population-based setting. DESIGN: Cross-sectional study. PARTICIPANTS: Ten percent of 4632 residents aged >/=40 years of Kumejima, an island off southwest Japan, were randomly selected. METHODS: We performed UBM under light and dark conditions in the 4 quadrants of the right eyes. The anatomic landmarks on the anterior ocular segment UBM images were identified by 1 examiner to quantify the peripheral anterior chamber depth (ACD), location of the ciliary body, and iris thickness. MAIN OUTCOME MEASURES: Angle-opening distance at 250 and 500 mum from the scleral spur (AOD250, AOD500), trabecular-iris angle (TIA), trabecular-ciliary process distance (TCPD), thickness of the iris (ID), trabecular-anterior iris surface angle (TAIA), trabecular-posterior iris surface angle (TPIA), trabecular-ciliary angle (TCA), and thickness of iris measured at 1000, 2000, and 3000 mum (IT1000, IT2000 and IT3000). RESULTS: The AOD500 averaged 0.267+/-0.138 (mean +/- standard deviation) and 0.202+/-0.116 mm under light and dark conditions, respectively; TIA 22.2+/-10.0 and 17.0+/-8.9 degrees; TCPD 0.755+/-0.165 and 0.748+/-0.152 mm; and ID 0.412+/-0.053 and 0.457+/-0.062 mm. The peripheral ACD was deepest temporally, then nasally, then inferiorly, and then superiorly (P<0.05, post hoc test). The position of the ciliary body was deepest nasally, then temporally, then inferiorly, and then superiorly (P<0.05). Iris thickness did not differ significantly among the quadrants. Older subjects had a shallower peripheral ACD, more anteriorly located ciliary body, and thinner iris (analysis of covariance, P<0.015). The peripheral ACD was deeper and the ciliary body was located more deeply in men than women (P<0.05), although no intergender differences in iris thickness were seen (P>0.1). Hyperopia, short axial length, and shallow central ACD were significantly correlated with shallower peripheral ACD, anteriorly located ciliary body, and thinner iris (P<0.05). Elevated intraocular pressure was associated with a shallow peripheral ACD (P
Department of Ophthalmology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan.
Classification:
6.12 Ultrasonography and ultrasound biomicroscopy (Part of: 6 Clinical examination methods)
2.4 Anterior chamber angle (Part of: 2 Anatomical structures in glaucoma)
1.1 Epidemiology (Part of: 1 General aspects)
