title: Repeatability and agreement of ocular biometry measurements: Aladdin versus Lenstar.
abstract: To assess the repeatability and agreement between the Aladdin and Lenstar biometers.
  
  
  
  Three consecutive measurements of the right eye of 102 subjects were acquired by the Aladdin (V.1.1.3) and the Lenstar (V.1.0.3), respectively, with a random order of which biometer to use first. Parameters compared included axial length (AL), anterior chamber depth (ACD), flat keratometry (Kf), steep keratometry (Ks), mean keratometry (Km), J0, J45and white-to-white (WTW) distance. Intraocular lens (IOL) power formulas included SRK/T (Sanders-Retzlaff-Kraff/Theoretical), Holladay 1, Hoffer Q and Haigis. Repeatability (Sr), repeatability limit (r) and Bland-Altman limits of agreement (LoA) were calculated.
  
  
  
  Srwas marginally better with the Lenstar for AL (0.02 mm), ACD (0.02 mm) and WTW distance (0.07 mm), but Srwas marginally better with the Aladdin for Kf (0.10 dioptre (D)), J0(0.07 D) and J45(0.06 D). In terms of agreement, the mean difference was small and non-statistically significant between the two devices for ACD, Ks and J45. The mean difference for Kf, Km, J0and WTW distance were all statistically significantly lower with the Aladdin than the Lenstar for the exception of WTW distance. The Bland-Altman LoA displayed narrow ranges implying good agreement with the exception for WTW distance. For IOL formulas, the mean difference was very small and not statistically significantly different. The LoA were narrow (within 0.50 D), implying acceptable use of each device interchangeably.
  
  
  
  High levels of repeatability and agreement were found between the Aladdin and Lenstar suggesting that the devices may be used interchangeably in normal eyes with refractive error.
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.|ABM University Health Board, Swansea, UK.|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 of the People's Republic of China, Wenzhou, Zhejiang, China.
authors.forename: Rongrong
authors.initials: R
authors.lastname: Gao
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.|Key Laboratory of Vision Science, Ministry of Health of the People's Republic of 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: Xiaorui
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.|Key Laboratory of Vision Science, Ministry of Health of the People's Republic of China, Wenzhou, Zhejiang, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Yu
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.|Key Laboratory of Vision Science, Ministry of Health of the People's Republic of China, Wenzhou, Zhejiang, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.|Key Laboratory of Vision Science, Ministry of Health of the People's Republic of China, Wenzhou, Zhejiang, China.
authors.forename: Qinmei
authors.initials: Q
authors.lastname: Wang
authors.affiliation: School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China.|Key Laboratory of Vision Science, Ministry of Health of the People's Republic of China, Wenzhou, Zhejiang, China.
authors.forename: Jinhai
authors.initials: J
authors.lastname: Huang
mesh_terms: D000293:Adolescent; D000328:Adult; D000869:Anterior Eye Segment / Q000033:anatomy & histology*; D058452:Axial Length, Eye / Q000033:anatomy & histology*; D001699:Biometry / Q000295:instrumentation*; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D015203:Reproducibility of Results; D055815:Young Adult
keywords: Anterior chamber; Imaging