title: Axial Length Measurement Failure Rates with the IOLMaster and Lenstar LS 900 in Eyes with Cataract.
abstract: OBJECTIVE
  To evaluate axial length (AL) measurement failure rate with the IOLMaster (Carl Zeiss AG, Germany) and Lenstar LS 900 (Haag-Streit AG, Switzerland) in eyes with cataract.
  
  
  METHODS
  Two hundred and ninety-six eyes of 170 patients with cataract were enrolled. Cataract type and severity were graded using the Lens Opacities Classification System III (LOCS III) and AL measurements were attempted with IOLMaster (version 5.4) and Lenstar LS 900 (version 1.1). Chi-squared analysis was used to assess if the difference in AL measurement acquisition rate was statistically significant between the two devices. The association of the different cataract types and severity with the AL measurement acquisition rate was evaluated with logistic regression analysis.
  
  
  RESULTS
  AL measurements were obtained in 184 eyes (62.16%) using the IOLMaster and 191 eyes (64.53%) using the Lenstar, which corresponds to a failure rate of 37.84% and 35.47% respectively. Chi-square analysis indicated no significant difference between the Lenstar and IOLMaster for AL measurement failure rate (x2 = 0.356, P = 0.550). Logistic regression analysis indicated no association between acquisition rates and cortical or nuclear cataracts with either device. There was a statistically significant association between acquisition rates and increasing severity of posterior subcapsular cataracts with the IOLMaster (β = -1.491, P<0.001) and Lenstar LS 900 (β = -1.507, P<0.001).
  
  
  CONCLUSIONS
  The IOLMaster and Lenstar LS 900 have similar AL measurement failure rates (35-38%) for Chinese public hospital cataract patients. Increasing severity of posterior subcapsular cataracts was problematic for both devices.
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China; Flinders University, Adelaide, South Australia, Australia.
authors.forename: Colm
authors.initials: C
authors.lastname: McAlinden
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China; Key Laboratory of Vision Science, Ministry of Health P.R. China, Wenzhou, Zhejiang, China.
authors.forename: Qinmei
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Flinders University, Adelaide, South Australia, Australia.
authors.forename: Konrad
authors.initials: K
authors.lastname: Pesudovs
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China; Key Laboratory of Vision Science, Ministry of Health P.R. China, Wenzhou, Zhejiang, China.
authors.forename: Fangjun
authors.initials: F
authors.lastname: Bao
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China; Key Laboratory of Vision Science, Ministry of Health P.R. China, Wenzhou, Zhejiang, China.
authors.forename: Ayong
authors.initials: A
authors.lastname: Yu
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Shishi
authors.initials: S
authors.lastname: Lin
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Yifan
authors.initials: Y
authors.lastname: Feng
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China; Key Laboratory of Vision Science, Ministry of Health P.R. China, Wenzhou, Zhejiang, China.
authors.forename: Jinhai
authors.initials: J
authors.lastname: Huang
mesh_terms: D002386:Cataract / Q000473:pathology*; D006801:Humans; D007910:Lenses, Intraocular; D011446:Prospective Studies