title: Repeatability data and agreement of keratometry with the VERION system compared to the IOLMaster.
abstract: OBJECTIVE
  To analyze the repeatability of keratometric and white-to-white (WTW) distance measurements with the VERION Measurement Module (Alcon Laboratories, Inc., Fort Worth, TX) and to compare the measured data to the results of the IOLMaster (Carl Zeiss Meditec, Jena, Germany).
  
  
  METHODS
  Three images were captured with the VERION and the flattest and steepest keratometric data, the astigmatism axis, and the WTW distance were recorded. Subsequently, the axial length, the keratometric data with axis, and the WTW distance were measured with an IOLMaster. The repeatability data of the keratometric value of the VERION System, converted to cross cylinder J0 and J45 vector components, were analyzed. The agreement data for keratometry obtained by the VERION System and the differences regarding keratometric data and WTW distance compared to IOLMaster were calculated.
  
  
  RESULTS
  The measurements were conducted in 50 eyes of 50 healthy volunteers (median age: 50.32 years, range: 19.34 to 85.3 years). The flattest and the steepest keratometric data, the diopter of astigmatism, the J0 and J45 vector components, and WTW distance did not differ significantly between devices (P > .05). Intraclass correlation coefficients (range: 0.863 to 0.994) and Cronbach's alpha values (range: 0.950 to 0.998) were high for all parameters measured by the VERION System.
  
  
  CONCLUSIONS
  The VERION System has high repeatability and agreement with the IOLMaster, making it suitable as an alternative tool in clinical practice.
authors.forename: Gabor
authors.initials: G
authors.lastname: Nemeth
authors.forename: Eszter
authors.initials: E
authors.lastname: Szalai
authors.forename: Ziad
authors.initials: Z
authors.lastname: Hassan
authors.forename: Agnes
authors.initials: A
authors.lastname: Lipecz
authors.forename: Andras
authors.initials: A
authors.lastname: Berta
authors.forename: Laszlo
authors.initials: L
authors.lastname: Modis
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000175:diagnosis; D058452:Axial Length, Eye / Q000033:anatomy & histology / Q000473:pathology; D001699:Biometry / Q000295:instrumentation; D003315:Cornea / Q000033:anatomy & histology*; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results