title: Intraobserver and interobserver repeatability of ocular components measurement in cataract eyes using a new optical low coherence reflectometer.
abstract: BACKGROUND
  The purpose of the study was to assess intraobserver and interobserver repeatability of eight ocular components measurement in cataract eyes using the optical low-coherence reflectometer Lenstar LS 900®.
  
  
  METHODS
  Five consecutive measurements of ocular components were taken by two examiners using the Lenstar. Components analyzed were: central corneal thickness, lens thickness, anterior chamber depth, axial length, retinal thickness, keratometry, white-to-white distance, and pupillometry. Within-subject standard deviation and the coefficient of variation were calculated for evaluation of intraobserver repeatability. Bland-Altman analysis was used for assessment of interobserver repeatability.
  
  
  RESULTS
  Thirty-two eyes of 22 patients were included. For both observers, the smallest intraobserver coefficient of variation was obtained for axial length, while the largest was found for corneal steepest meridian position. Interobserver repeatability demonstrated less repeatable results for white-to-white distance and corneal steepest meridian position. Considering axial length and anterior chamber depth values, predicted refractive error was 0 ± 0.05 D and 0.02 ± 0.19 D respectively in 95% of observations.
  
  
  CONCLUSIONS
  The Lenstar LS 900® evidenced excellent repeatability and observers´ independent results of all components analyzed except white-to-white distance and corneal steepest meridian position measurements. To the best of our knowledge, this is the first study on interobserver repeatability of optical low-coherence reflectometry in cataract eyes.
authors.affiliation: University Eye Clinic, University Hospital Sveti Duh, Sveti Duh 64, 10000, Zagreb, Croatia. mbjelos@mef.hr
authors.forename: Mirjana
authors.initials: M
authors.lastname: Bjeloš Rončević
authors.forename: Mladen
authors.initials: M
authors.lastname: Bušić
authors.forename: Ivan
authors.initials: I
authors.lastname: Cima
authors.forename: Biljana
authors.initials: B
authors.lastname: Kuzmanović Elabjer
authors.forename: Damir
authors.initials: D
authors.lastname: Bosnar
authors.forename: Daliborka
authors.initials: D
authors.lastname: Miletić
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology; D058452:Axial Length, Eye / Q000473:pathology; D001699:Biometry / Q000295:instrumentation; D001837:Body Weights and Measures; D002386:Cataract / Q000473:pathology*; D003315:Cornea / Q000473:pathology; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D005123:Eye / Q000473:pathology*; D006801:Humans; D007368:Interferometry; D007908:Lens, Crystalline / Q000473:pathology; D008027:Light; D008875:Middle Aged; D015588:Observer Variation; D011446:Prospective Studies; D015203:Reproducibility of Results; D012160:Retina / Q000473:pathology