title: Comparison of postoperative refractive outcomes: IOLMaster® versus immersion ultrasound.
abstract: OBJECTIVE
  To compare the postoperative refractive outcomes between IOLMaster biometry (Carl Zeiss Meditec, Inc., Dublin, CA) and immersion ultrasound biometry for axial length measurements.
  
  
  METHODS
  Refractive outcomes in 354 eyes were compared using the IOLMaster and the immersion ultrasound biometry. Predicted refraction was determined using manual keratometry and the SRK-T formula with personalized A-constant.
  
  
  RESULTS
  The axial lengths measured using the IOLMaster and immersion ultrasound were 24.49 ± 2.11 and 24.46 ± 2.11 mm, respectively, and the difference was significant (P < .05). The mean errors were 0.000 ± 0.578 D with the IOLMaster, and 0.000 ± 0.599 D with the immersion ultrasound, but the difference was not significant. The mean absolute error was smaller with the IOLMaster than with immersion ultrasound (0.463 ± 0.341 vs 0.479 ± 0.359 D), but the difference was not significant.
  
  
  CONCLUSIONS
  IOLMaster biometry yields highly accurate results in cataract surgery. However, if the IOLMaster is unavailable, immersion ultrasound biometry with personalized intraocular lens constants is an acceptable alternative.
authors.affiliation: The Catholic Institute for Visual Science, The Catholic University of Korea, Seoul, Korea.
authors.forename: Woong-Joo
authors.initials: WJ
authors.lastname: Whang
authors.forename: Byung-Ju
authors.initials: BJ
authors.lastname: Jung
authors.forename: Tae-Hoon
authors.initials: TH
authors.lastname: Oh
authors.forename: Yong-Soo
authors.initials: YS
authors.lastname: Byun
authors.forename: Choun-Ki
authors.initials: CK
authors.lastname: Joo
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002386:Cataract / Q000000981:diagnostic imaging* / Q000503:physiopathology; D002387:Cataract Extraction; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012029:Refraction, Ocular / Q000502:physiology*; D012030:Refractive Errors / Q000000981:diagnostic imaging*; D012189:Retrospective Studies; D014463:Ultrasonography