title: Relationship between relative lens position and appositional closure in eyes with narrow angles.
abstract: OBJECTIVE
  To investigate the relationship between relative lens position (RLP) and appositional closure in eyes with narrow angles.
  
  
  METHODS
  Ultrasound biomicroscopy (UBM) was used to measure anterior chamber depth (ACD) and lens thickness (LT), and the IOLMaster to measure axial length (AL). The number of quadrants with appositional closure was assessed by UBM under dark conditions. The RLP was calculated thus: RLP = 10 × (ACD + 0.5 LT) /AL.
  
  
  RESULTS
  This study comprised 30 consecutive patients (30 eyes) with narrow-angle eyes defined as Shaffer grade 2 or lower and without peripheral anterior synechiae (24 women, 6 men; mean age ± SD, 67.3 ± 10.4 years; range, 42-87 years). Under dark conditions, 66.7% of the eyes with narrow angles showed appositional closure in at least one quadrant. Of the various ocular biometric parameters, only the RLP significantly decreased with appositional closure in at least one quadrant (P = 0.005).
  
  
  CONCLUSIONS
  A decrease in the RLP can be predictive of appositional closure for narrow-angle eyes under dark conditions.
authors.affiliation: Department of Ophthalmology, National Hospital Organization Osaka National Hospital, Osaka, Japan. yotori@onh.go.jp
authors.forename: Yasumasa
authors.initials: Y
authors.lastname: Otori
authors.forename: Yuki
authors.initials: Y
authors.lastname: Tomita
authors.forename: Ayumi
authors.initials: A
authors.lastname: Hamamoto
authors.forename: Kanae
authors.initials: K
authors.lastname: Fukui
authors.forename: Shinichi
authors.initials: S
authors.lastname: Usui
authors.forename: Misako
authors.initials: M
authors.lastname: Tatebayashi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000000981:diagnostic imaging*; D058452:Axial Length, Eye / Q000000981:diagnostic imaging*; D001699:Biometry / Q000379:methods; D003624:Darkness; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D006801:Humans; D007908:Lens, Crystalline / Q000000981:diagnostic imaging*; D008297:Male; D033401:Microscopy, Acoustic; D008875:Middle Aged; D012189:Retrospective Studies