title: Hong's grading for evaluating anterior chamber angle width.
abstract: OBJECTIVE
  To compare Hong's grading method with anterior segment optical coherence tomography (AS-OCT), gonioscopy, and the dark-room prone-position test (DRPT) for evaluating anterior chamber width.
  
  
  METHODS
  The anterior chamber angle was graded using Hong's grading method, and Hong's angle width was calculated from the arctangent of Hong's grades. The correlation between Hong's angle width and AS-OCT parameters was analyzed. The area under the receiver operating characteristic curve (AUC) for Hong's grading method when discriminating between narrow and open angles as determined by gonioscopy was calculated. Correlation analysis was performed between Hong's angle width and intraocular pressure (IOP) changes determined by DRPT.
  
  
  RESULTS
  A total of 60 subjects were enrolled. Of these subjects, 53.5 % had a narrow angle. Hong's angle width correlated significantly with the AS-OCT parameters (r = 0.562-0.719, P < 0.01). A Bland-Altman plot showed relatively good agreement between Hong's angle width and the angle width obtained by AS-OCT. The ability of Hong's grading method to discriminate between open and narrow angles was good (AUC = 0.868, 95 % CI 0.756-0.942). A significant linear correlation was found between Hong's angle width and IOP change determined by DRPT (r = -0.761, P < 0.01).
  
  
  CONCLUSIONS
  Hong's grading method is useful for detecting narrow angles. Hong's grading correlated well with AS-OCT parameters and DRPT.
authors.affiliation: Department of Ophthalmology, Seoul National University College of Medicine, #28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea.
authors.forename: Seok Hwan
authors.initials: SH
authors.lastname: Kim
authors.forename: Ja Heon
authors.initials: JH
authors.lastname: Kang
authors.forename: Ki Ho
authors.initials: KH
authors.lastname: Park
authors.forename: Chul
authors.initials: C
authors.lastname: Hong
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology*; D019540:Area Under Curve; D003623:Dark Adaptation; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000175:diagnosis*; D005902:Glaucoma, Open-Angle / Q000175:diagnosis*; D006068:Gonioscopy / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D049451:Nomograms; D016684:Prone Position; D012372:ROC Curve; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence