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Purpose:To evaluate the prevalence of plateau iris diagnosed by ultrasound biomicroscopy after laser peripheral iridotomy in Whites as compared to Asians in a U.S.clinic setting.Methods:This was a prospective,observational study of narrow angle patients(n=55) who underwent laser peripheral iridotomy.Ultrasound biomicroscopy was performed in 4 quadrants of only one eye of each patient 4～6 weeks before and after surgery.The images were randomized and interpreted qualitatively by a single observer. Plateau iris was diagnosed in eyes with persistent appositional angles after laser peripheral iridotomy when at least 2 quadrants fulfilled the following criteria:1.The ciliary process was directed anteriorly.2.The ciliary sulcus was absent.3.The central iris plane was flat.Results:Twenty eight subjects (50.1％) were Whites,and 27subjects (49.0％) were Asians.Plateau iris was assessed in 18subjects(32.7％):9 of 28 Whites (32.1％) and 9 of 27 Asians (33.3％).The proportion of plateau iris did not differ between Whites and Asians(P ＞ 0.99).Conclusion:The prevalence of plateau iris did not differ between Whites and Asians.Both groups had a substantial proportion of narrow angle patients with this clinical entity.(Eye Science 2012;27:13-18)