title: New comparative ultrasound biomicroscopic findings between fellow eyes of acute angle closure and glaucomatous eyes with narrow angle.
abstract: OBJECTIVE
  To compare morphometric features between fellow acute primary angle-closure (APAC) eyes and glaucomatous or suspect eyes with narrow angle (NA).
  
  
  METHODS
  Fellow eyes of 30 patients with unilateral APAC and 30 with NA were evaluated by ultrasound biomicroscopy (UBM) under light and dark conditions. UBM parameters such as anterior chamber depth (ACD), angle opening distance at 250 microm/500 microm from the scleral spur (AOD250/AOD500), trabecular ciliary process distance (TCPD) and iris-lens contact distance (ILCD) were measured in the superior (SQ) and inferior (IQ) quadrants.
  
  
  RESULTS
  Significant differences between APAC fellow and NA eyes were found in ACD, P<0.001; AOD250 at SQ and IQ, P<0.001; AOD500 at SQ and IQ, P<0.001; TCPD light, P=0.010 and TCPD dark at SQ, P=0.031; and TCPD light at IQ, P=0.010. Significant differences between light and dark examinations of APAC fellow eyes were found in ILCD (P=0.009) at SQ and ILCD at IQ (P=0.006), and of NA eyes in ILCD at SQ (P=0.047) and ILCD at IQ (P<0.001).
  
  
  CONCLUSIONS
  APAC fellow eyes have a more crowded anterior segment and shallower ACD than NA eyes. ILCD decreases in both groups when the illumination conditions change from light to dark.
authors.affiliation: Faculdade de Medicina da Universidade Federal de Minas Gerais - Belo Horizonte (MG) - Brasil. rafaelmerula@hotmail.com
authors.forename: Rafael Vidal
authors.initials: RV
authors.lastname: Mérula
authors.forename: Sebastião
authors.initials: S
authors.lastname: Cronemberger
authors.forename: Alberto
authors.initials: A
authors.lastname: Diniz Filho
authors.forename: Nassim
authors.initials: N
authors.lastname: Calixto
mesh_terms: D000208:Acute Disease; D000221:Adaptation, Ocular / Q000502:physiology*; D000368:Aged; D000867:Anterior Chamber / Q000000981:diagnostic imaging / Q000503:physiopathology; D000869:Anterior Eye Segment / Q000000981:diagnostic imaging* / Q000503:physiopathology; D016009:Chi-Square Distribution; D003623:Dark Adaptation / Q000502:physiology; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006068:Gonioscopy; D006801:Humans; D007429:Intraocular Pressure; D007498:Iris / Q000000981:diagnostic imaging / Q000503:physiopathology; D008297:Male; D033401:Microscopy, Acoustic; D008875:Middle Aged; D011446:Prospective Studies; D012590:Sclera / Q000000981:diagnostic imaging / Q000503:physiopathology