title: Plateau iris in Whites versus Asians.
abstract: OBJECTIVE
  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 27 subjects (49.0%) were Asians. Plateau iris was assessed in 18 subjects (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)
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Ophthalmology, University of California, San Francisco, CA, USA.
authors.forename: Thidarat
authors.initials: T
authors.lastname: Leeungurasatien
authors.forename: Sunita
authors.initials: S
authors.lastname: Radhakrishnan
authors.forename: Travis
authors.initials: T
authors.lastname: Porco
authors.forename: Guofu
authors.initials: G
authors.lastname: Huang
authors.forename: Senad
authors.initials: S
authors.lastname: Osmanovic
authors.forename: Jehn-Yu
authors.initials: JY
authors.lastname: Huang
authors.forename: Shan
authors.initials: S
authors.lastname: Lin
mesh_terms: D044466:Asian People; D002924:Ciliary Body / Q000473:pathology; D005260:Female; D015812:Glaucoma, Angle-Closure; D006801:Humans; D007429:Intraocular Pressure; D032801:Iridectomy / Q000379:methods*; D007498:Iris / Q000473:pathology*; D007499:Iris Diseases / Q000208:ethnology / Q000473:pathology*; D053685:Laser Therapy; D008297:Male; D033401:Microscopy, Acoustic; D015588:Observer Variation; D015995:Prevalence; D011446:Prospective Studies; D044465:White People