Comparison and evaluation of ocular biometry using a new noncontact optical low-coherence reflectometer

Ophthalmology. 2009 Nov;116(11):2087-92. doi: 10.1016/j.ophtha.2009.04.019. Epub 2009 Sep 10.


Purpose: 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).

Design: Exploratory evaluation of diagnostic technology and nonrandomized, prospective clinical trial.

Participants: 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.

Main outcome measures: 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.

Publication types

  • Clinical Trial
  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Anterior Chamber / pathology*
  • Aphakia, Postcataract / pathology
  • Biometry / instrumentation*
  • Cataract / pathology
  • Cornea / pathology*
  • Diagnostic Techniques, Ophthalmological*
  • Eye / pathology*
  • Female
  • Humans
  • Interferometry / instrumentation
  • Light
  • Male
  • Middle Aged
  • Prospective Studies
  • Pseudophakia / pathology
  • Silicone Oils / administration & dosage
  • Young Adult


  • Silicone Oils