title: Evaluation and comparison of the new swept source OCT-based IOLMaster 700 with the IOLMaster 500.
abstract: OBJECTIVE
  To compare the measurements and failure rates obtained with a new swept source optical coherence tomography (OCT)-based biometry to IOLMaster 500.
  
  
  METHODS
  Eye Clinic, Baskent University Faculty of Medicine, Ankara, Turkey.
  
  
  METHODS
  Observational cross-sectional study and evaluation of a new diagnostic technology.
  
  
  METHODS
  188 eyes of 101 subjects were included in the study. Measurements of axial length (AL), anterior chamber depth (ACD), corneal power (K1 and K2) and the measurement failure rate with the new Zeiss IOLMaster 700 were compared with those obtained with the IOLMaster 500. The results were evaluated using Bland-Altman analyses. The differences between both methods were assessed using the paired samples t test, and their correlation was evaluated by intraclass correlation coefficient (ICC).
  
  
  RESULTS
  The mean age was 68.32±12.71 years and the male/female ratio was 29/72. The agreements between two devices were outstanding regarding AL (ICC=1.0), ACD (ICC=0.920), K1 (ICC=0.992) and K2 (ICC=0.989) values. IOLMaster 700 was able to measure ACD AL, K1 and K2 in all eyes within high-quality SD limits of the manufacturer. IOLMaster 500 was able to measure ACD in 175 eyes, whereas measurements were not possible in the remaining 13 eyes. AL measurements were not possible for 17 eyes with IOLMaster 500. Nine of these eyes had posterior subcapsular cataracts and eight had dense nuclear cataracts.
  
  
  CONCLUSIONS
  Although the agreement between the two devices was excellent, the IOLMaster 700 was more effective in obtaining biometric measurements in eyes with posterior subcapsular and dense nuclear cataracts.
authors.affiliation: Department of Ophthalmology, Başkent University, Faculty of Medicine, Ankara, Turkey.
authors.forename: Ahmet
authors.initials: A
authors.lastname: Akman
authors.affiliation: Department of Ophthalmology, Başkent University, Faculty of Medicine, Ankara, Turkey.
authors.forename: Leyla
authors.initials: L
authors.lastname: Asena
authors.affiliation: Department of Ophthalmology, Başkent University, Faculty of Medicine, Ankara, Turkey.
authors.forename: Sirel Gür
authors.initials: SG
authors.lastname: Güngör
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D058452:Axial Length, Eye / Q000033:anatomy & histology*; D001699:Biometry / Q000295:instrumentation*; D003430:Cross-Sectional Studies; D004867:Equipment Design; D005260:Female; D006801:Humans; D007368:Interferometry / Q000295:instrumentation; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012372:ROC Curve; D015203:Reproducibility of Results; D041623:Tomography, Optical Coherence / Q000295:instrumentation*; D014792:Visual Acuity; D055815:Young Adult
keywords: Diagnostic tests/Investigation; Optics and Refraction