title: Comparison of anterior segment morphology following prophylactic laser peripheral iridotomy in Caucasian and Chinese eyes.
abstract: BACKGROUND
  To compare anterior segment biometric parameters between Caucasians and Chinese before and after laser peripheral iridotomy.
  
  
  METHODS
  Prospective clinical cohort study.
  
  
  METHODS
  Caucasian and Chinese primary angle-closure suspects.
  
  
  METHODS
  Anterior segment optical coherence tomography images captured before and after laser peripheral iridotomy were analysed to measure anterior segment biometric parameters. Paired Student's t-tests were used for within-ethnic group comparisons. Univariate and linear mixed-effect regression models were used for between-ethnic group comparisons.
  
  
  METHODS
  Angle opening distance, angle recess area, iris thickness, iris curvature, anterior chamber area, anterior chamber volume and anterior chamber width.
  
  
  RESULTS
  Caucasians had significantly greater preoperative angle recess area, anterior chamber width, and iris curvature and lower preoperative iris thickness compared to Chinese (P < 0.05). Significant postoperative increases in angle opening distance, angle recess area, anterior chamber area, anterior chamber volume, and anterior chamber width along with significant postoperative decrease in iris curvature were observed within both ethnic groups (P < 0.05). However, the amount of laser peripheral iridotomy-induced changes in angle opening distance, angle recess area, anterior chamber area, anterior chamber volume, anterior chamber width, and iris curvature did not differ between the two ethnic groups (P < 0.05).
  
  
  CONCLUSIONS
  Both Caucasian and Chinese demonstrated opening of anterior chamber angle width, expansion of anterior chamber dimensions, and flattening of iris convexity after laser peripheral iridotomy. Although certain aspects of anterior segment anatomy differed between Caucasians and Chinese preoperatively, they did not translate into significant ethnic differences in the amount of laser peripheral iridotomy-induced changes in the anterior segment biometric parameters.
authors.affiliation: Department of Ophthalmology, University of California, San Francisco, California, USA.
authors.forename: Roland Y
authors.initials: RY
authors.lastname: Lee
authors.forename: Toshimitsu
authors.initials: T
authors.lastname: Kasuga
authors.forename: Qi N
authors.initials: QN
authors.lastname: Cui
authors.forename: Guofu
authors.initials: G
authors.lastname: Huang
authors.forename: Mingguang
authors.initials: M
authors.lastname: He
authors.forename: Shan C
authors.initials: SC
authors.lastname: Lin
mesh_terms: D000368:Aged; D000869:Anterior Eye Segment / Q000473:pathology*; D044466:Asian People / Q000208:ethnology*; D001699:Biometry; D002681:China / Q000453:epidemiology; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000208:ethnology / Q000601:surgery*; D006068:Gonioscopy; D006801:Humans; D007429:Intraocular Pressure; D032801:Iridectomy / Q000379:methods*; D007498:Iris / Q000601:surgery*; D053685:Laser Therapy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D041623:Tomography, Optical Coherence; D044465:White People / Q000208:ethnology*
keywords: angle closure; anterior segment optical coherence tomography; ethnicity; glaucoma; laser peripheral iridotomy