title: Comparison of two partial coherence interferometry devices for ocular biometry.
abstract: BACKGROUND
  An estimation of the repeatability of the Lenstar LS 900 biometry parameters and comparison of these measurements to those evaluated with the IOLMaster were carried out.
  
  
  METHODS
  Axial length, corneal curvature, anterior chamber depth, central corneal thickness and lens thickness measurements were performed in 145 eyes using the Lenstar LS 900, while axial length, corneal curvature and anterior chamber depth were measured using the IOLMaster. The repeatability coefficients and the coefficients of variation were assessed. The Bland-Altman plots and the regression analysis were applied to evaluate the differences between the two methods.
  
  
  RESULTS
  Axial length was the most repeatable parameter and lens thickness the most variable. Axial length and corneal curvature measurements by IOLMaster and Lenstar LS 900 showed a good correlation (mean differences: 0.03 and 0.01 mm). Anterior chamber depth measurements by the two instruments resulted in a difference of 0.2 mm (all p values < 0.0001). Regression analysis showed a highly significant correlation between measurements by the two methods. Correlation coefficients were: axial length 0.999, corneal curvature 0.983, anterior chamber depth 0.925 (p < 0.0001). Bland-Altman plots demonstrated that measurements by the tested devices were closely related without systematic effects in the range of evaluated data.
  
  
  CONCLUSIONS
  Lenstar measurements yielded a high repeatability and correlate highly significant with the IOLMaster measurements.
authors.affiliation: Department of Retinology, Klinik Pallas, Olten, Switzerland.
authors.forename: Z
authors.initials: Z
authors.lastname: Liampa
authors.forename: M
authors.initials: M
authors.lastname: Kynigopoulos
authors.forename: G
authors.initials: G
authors.lastname: Pallas
authors.forename: H
authors.initials: H
authors.lastname: Gerding
mesh_terms: D000368:Aged; D001699:Biometry / Q000295:instrumentation*; D002387:Cataract Extraction / Q000295:instrumentation*; D019781:Corneal Topography / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D007368:Interferometry / Q000295:instrumentation*; D008297:Male; D011300:Preoperative Care / Q000295:instrumentation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence / Q000295:instrumentation*