title: Quantitative ultrasound biomicroscopy study of biometry of the lens and anterior chamber.
abstract: OBJECTIVE
  To quantify the changes induced by cataract extraction (CE) in angle recess area (ARA), angle opening distance at 250 and 500 µm (AOD250, AOD500), and aqueous depth (AQD) in comparison with axial lens thickness (LT) and to reveal effects of LT and lens position (LP) on angle parameters and AQD using ultrasound biomicroscopy (UBM).
  
  
  METHODS
  Thirty-five eyes of 35 patients (22 male; mean age 69.5 ± 7.8 years) with senile or presenile cataract who consecutively underwent cataract surgery were enrolled in this institutional study. We performed UBM examinations before and 1 month after surgery under a standard protocol. Axial images of the anterior segment and radial sections of the angle at 4 quadrants were obtained. Aqueous depth and LT were measured in immersion A-scan mode and we used UBM Pro 2000® software for the ARA, AOD250, and AOD500.
  
  
  RESULTS
  Aqueous depth and angle parameters at 4 quadrants were increased significantly after CE (p<0.05). The mean LT was 4.53 ± 0.37 mm and LP was 4.96 ± 0.25 mm preoperatively. There were statistically significant correlations between LT, LP, and AQD and angle parameters preoperatively. We also determined statistically significant correlations between LT, LP, and postoperative changes in AQD and angle parameters In comparison with LT, the mean increases in AQD, ARA, AOD250, and AOD500 were 0.21, 0.014, 0.012, and 0.017 times, respectively.
  
  
  CONCLUSIONS
  The results suggest that LT is as a significant factor as LPon the final dimensions of the anterior chamber and angle.
authors: Department of Ophthalmology, GATA Haydarpasa Training Hospital, Istanbul, Turkey.
authors: Ilhami
authors: I
authors: Salcan
authors: Umit
authors: U
authors: Aykan
authors: Ozlem
authors: O
authors: Yildirim
authors: Arzu
authors: A
authors: Kanik
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000000981:diagnostic imaging* / Q000473:pathology; D001082:Aqueous Humor; D001699:Biometry; D002386:Cataract / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007908:Lens, Crystalline / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D033401:Microscopy, Acoustic; D008875:Middle Aged; D009929:Organ Size; D018918:Phacoemulsification; D011446:Prospective Studies