title: Comparison and evaluation of ocular biometry using a new noncontact optical low-coherence reflectometer.
abstract: OBJECTIVE
  To evaluate a new high-resolution noncontact biometer (Lenstar; Haag-Streit AG, Koeniz, Switzerland) using optical low-coherence reflectometry and to compare the clinical measurements with those obtained from the IOLMaster (Carl Zeiss, Jena, Germany) and the Pachmumeter (Haag-Streit AG).
  
  
  METHODS
  Exploratory evaluation of diagnostic technology and nonrandomized, prospective clinical trial.
  
  
  METHODS
  Eighty subjects (144 eyes) aged 20 to 90 years with cataractous, pseudophakic, aphakic, silicon oil-filled, or normal eyes.
  
  
  METHODS
  Measurements of axial length (AL), anterior chamber depth (ACD), central corneal thickness (CCT), corneal radius (R1 [flattest radius of corneal curvature] and R2 [steep radius, 90 degrees apart from R1]), and axis of the flattest radius (Ax1) obtained with the Lenstar were compared with those obtained with the IOLMaster or Pachmumeter. The results were evaluated using Bland-Altman analyses. The differences between both methods were assessed using the paired t test, and its correlation was evaluated by Pearson coefficient.
  
  
  METHODS
  Axial length, CCT, ACD, R1, R2, and Ax1.
  
  
  RESULTS
  The overall mean AL measured with the Lenstar and the IOLMaster was 24.1 mm (r = 0.999). Anterior chamber depth was 3.19 mm (Lenstar) and 3.17 mm (IOLMaster; r = 0.875). Excellent correlations also were found for the corneal radius and the axis of flattest radius (R1, r = 0.927; R2, r = 0.929; and Ax1, r = 0.938). Mean CCT was 0.557 mm (r = 0.978) for both Lenstar and Pachmumeter.
  
  
  CONCLUSIONS
  Measurements with the new Lenstar correlated well with those with the IOLMaster and Pachmumeter in cataractous, pseudophakic, aphakic, silicon oil-filled, and normal eyes. It is an accurate, fast instrument that provides additional information of interest to any cataract or refractive surgeon.
authors.affiliation: Department of Ophthalmology, Inselspital, University Bern, Bern, Switzerland.
authors.forename: Kaspar
authors.initials: K
authors.lastname: Rohrer
authors.forename: Beatrice E
authors.initials: BE
authors.lastname: Frueh
authors.forename: Rudolf
authors.initials: R
authors.lastname: Wälti
authors.forename: Isabelle A
authors.initials: IA
authors.lastname: Clemetson
authors.forename: Christoph
authors.initials: C
authors.lastname: Tappeiner
authors.forename: David
authors.initials: D
authors.lastname: Goldblum
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology*; D001036:Aphakia, Postcataract / Q000473:pathology; D001699:Biometry / Q000295:instrumentation*; D002386:Cataract / Q000473:pathology; D003315:Cornea / Q000473:pathology*; D003941:Diagnostic Techniques, Ophthalmological; D005123:Eye / Q000473:pathology*; D005260:Female; D006801:Humans; D007368:Interferometry / Q000295:instrumentation; D008027:Light; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D019591:Pseudophakia / Q000473:pathology; D012827:Silicone Oils / Q000008:administration & dosage; D055815:Young Adult
chemical_list: D012827:Silicone Oils