title: Evaluation of the Lenstar LS 900 non-contact biometer.
abstract: OBJECTIVE
  Evaluation of the reproducibility of the Lenstar LS 900 non-contact biometer, and a comparison with the Visante anterior-segment optical coherence tomography (AS-OCT) and the IOLMaster.
  
  
  METHODS
  Central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), keratometry (K) values, corneal diameter (CD) and axial length (AL) were obtained in 38 healthy volunteers (76 eyes) to determine the reproducibility of the Lenstar. CCT, ACD, CD, K values and AL measurements measured with the Lenstar were compared with the AS-OCT and IOLMaster. Intraocular lens (IOL) power calculations were done to study the significance of the difference between AL measurements.
  
  
  RESULTS
  The reproducibility of the Lenstar was better than 0.9% for CCT, ACD, LT, K values and AL measurements. Although all correlations were highly significant (p<0.001), all comparisons showed a significant difference, except for the comparison of CD measurements using the Lenstar and IOLMaster (p = 0.175). The differences in IOL power calculations for an AL of 20, 25 and 30 mm with a mean difference between Lenstar and IOLMaster AL measurements of 0.03 mm, were 0.13 D, 0.10 D and 0.08 D, respectively.
  
  
  CONCLUSIONS
  The reproducibility of the Lenstar was excellent. Small but significant differences exist between the Lenstar, Visante OCT and the IOLMaster. Therefore, measurements of the Lenstar, AS-OCT and IOLMaster are not interchangeable. Despite the significant difference between AL measurements, there is no clinically significant difference in the IOL power calculation results.
authors.affiliation: Department of Ophthalmology, University Hospital Maastricht, P Debyelaan 25, 6202 AZ, Maastricht, The Netherlands. lcruysberg@gmx.net
authors.forename: L P J
authors.initials: LP
authors.lastname: Cruysberg
authors.forename: M
authors.initials: M
authors.lastname: Doors
authors.forename: F
authors.initials: F
authors.lastname: Verbakel
authors.forename: T T J M
authors.initials: TT
authors.lastname: Berendschot
authors.forename: J
authors.initials: J
authors.lastname: De Brabander
authors.forename: R M M A
authors.initials: RM
authors.lastname: Nuijts
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000033:anatomy & histology; D001699:Biometry / Q000295:instrumentation* / Q000379:methods; D003315:Cornea / Q000033:anatomy & histology; D019781:Corneal Topography / Q000295:instrumentation / Q000379:methods; D005260:Female; D006801:Humans; D007908:Lens, Crystalline / Q000033:anatomy & histology; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D015203:Reproducibility of Results; D041623:Tomography, Optical Coherence / Q000295:instrumentation / Q000379:methods; D055815:Young Adult