title: Ocular biometry in acute and chronic angle-closure glaucoma.
abstract: OBJECTIVE
  To evaluate the biometric difference between eyes with acute angle-closure (AAC) attack, their uninvolved fellow eyes and eyes with chronic angle-closure glaucoma (CACG).
  
  
  METHODS
  Patients with prior laser iridotomy on both eyes for unilateral AAC attack or CACG were recruited. We compared ocular biometric parameters by A-scan ultrasonography of the acutely affected eyes with those of the uninvolved fellow eyes and with eyes affected by CACG.
  
  
  RESULTS
  Thirty-three patients with unilateral AAC attack and 41 patients with CACG were included. The eyes with AAC attack had a significantly shallower anterior chamber depth (ACD), thicker lens, shorter axial length, higher lens/axial length factor and more anteriorly positioned lens than the eyes with CACG. The uninvolved fellow eyes had a significantly shallower ACD, shorter axial length and higher lens/axial length factor compared with the eyes with CACG. Acutely affected eyes had a shallower ACD and more anteriorly positioned lens than did the uninvolved fellow eyes.
  
  
  CONCLUSIONS
  Eyes with AAC attack had a more crowded anterior segment compared with uninvolved fellow eyes and those affected by CACG. In addition to ACD, relative lens size, represented by the lens/axial length factor, and relative lens position appear to play important roles in the development of AAC attack.
authors.affiliation: Department of Ophthalmology, Mackay Memorial Hospital, Taipei, Taiwan (ROC).
authors.forename: Yu-Wen
authors.initials: YW
authors.lastname: Lan
authors.forename: Jui-Wen
authors.initials: JW
authors.lastname: Hsieh
authors.forename: Por-Tying
authors.initials: PT
authors.lastname: Hung
mesh_terms: D000208:Acute Disease; D000368:Aged; D000867:Anterior Chamber / Q000000981:diagnostic imaging; D002908:Chronic Disease; D005123:Eye / Q000000981:diagnostic imaging*; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D007498:Iris / Q000601:surgery; D007908:Lens, Crystalline / Q000000981:diagnostic imaging; D008297:Male; D008499:Medical Records; D008875:Middle Aged; D013508:Ophthalmologic Surgical Procedures; D014463:Ultrasonography