title: Evaluation of the Narrow Anterior Chamber Angle by Anterior Segment Optical Coherence Tomography.
abstract: BACKGROUND
  The aim of this work was to evaluate the narrow anterior chamber angle (ACA) in Chinese patients by anterior segment optical coherence tomography (As-OCT).
  
  
  METHODS
  Eighty right eyes of 80 consecutive patients with a shallow peripheral anterior chamber but no peripheral anterior synechia were enrolled in this study. The ACA was observed by noncompression gonioscopy and classified according to the Shaffer grading system. The iridotrabecular contact (ITC) and trabecular-iris angle (T-I angle) were assessed by As-OCT examination.
  
  
  RESULTS
  Gonioscopic grade 0 and ITC were observed more frequently in the superior quadrant than the other quadrants (p < 0.02). The T-I angle was signiﬁcantly smaller superiorly and inferiorly than nasally and temporally (p < 0.01). The frequency of the ITC and T-I angle significantly declined when the gonioscopic grade was from 0 to 2 (p < 0.01). Logistic analysis showed that the axial length and refraction were related to the presence of ITC in more than two quadrants (p < 0.03).
  
  
  CONCLUSIONS
  ITC was common in eyes with a shallow peripheral anterior chamber (superiorly, gonioscopic grade 0). Sites with wider gonioscopic grading tended to have a larger T-I angle. Axial length and refraction significantly impacted on the frequency of ITC.
authors.affiliation: Qingdao University Medical College, Qingdao, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Lan
authors.forename: Dapeng
authors.initials: D
authors.lastname: Sun
authors.forename: Khatoon
authors.initials: K
authors.lastname: Alabdulrasool
authors.forename: Hassan
authors.initials: H
authors.lastname: Ebrahim Yusuf
authors.forename: Lu
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000368:Aged; D000869:Anterior Eye Segment / Q000000981:diagnostic imaging*; D005260:Female; D005500:Follow-Up Studies; D015812:Glaucoma, Angle-Closure / Q000175:diagnosis* / Q000503:physiopathology; D006068:Gonioscopy; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D041623:Tomography, Optical Coherence / Q000379:methods*