title: Comparison of keratometry and white-to-white measurements obtained by Lenstar with those obtained by autokeratometry and corneal topography.
abstract: OBJECTIVE
  To compare anterior eye segment measurements obtained using low optical coherence reflectometry (LENSTAR LS900, Haag-Streit), autokeratometry (RC-5000, Tomey) and corneal topography (Topolyzer, Wavelight).
  
  
  METHODS
  In 46 healthy subjects, flat keratometry (Kf), steep keratometry (Ks), mean keratometry (Km) and white-to-white (WTW) distance were measured by Lenstar, Tomey RC-5000 and Topolyzer.
  
  
  RESULTS
  Kf and Km measurements of Lenstar were significantly steeper than Tomey RC-5000 (both p<0.001), but the 95% LoA of them were narrow (-0.22 to 0.46D, -0.16 to 0.36D, respectively). There were no significant differences between the Kf and Km measurements of Lenstar and Topolyzer, with a narrow 95% LoA. There were no significant differences between the Ks measurements of Lenstar and Tomey RC-5000, and Lenstar and Topolyzer. A good agreement was found between them with 95% LoA of -0.40 to 0.56D, and -0.56 to 0.64D, respectively. WTW measurements with Lenstar were greater than those with Tomey RC-5000 and Topolyzer (p=0.042, p<0.01, respectively). A good agreement existed between the WTW obtained by Lenstar and Topolyzer, Tomey RC-5000, with 95% LoA ranging from -0.13 to 0.74mm and -0.33 to 0.51mm.
  
  
  CONCLUSIONS
  Generally good agreement was found between the Lenstar and Tomey RC-5000, Topolyzer for K and WTW measurements. In clinical practice, K and WTW measurements obtained by Lenstar and Tomey RC-5000, Topolyzer can be used interchangeably.
authors.affiliation: School of Optometry and Ophthalmology and Eye Hospital, 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
authors.affiliation: G.B. Bietti Foundation IRCCS, Rome, Italy.
authors.forename: Giacomo
authors.initials: G
authors.lastname: Savini
authors.affiliation: School of Optometry and Ophthalmology and Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China; Key Laboratory of Vision Science, Ministry of Health P.R. China, Wenzhou, Zhejiang, China.
authors.forename: Binbin
authors.initials: B
authors.lastname: Su
authors.affiliation: School of Optometry and Ophthalmology and Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Zhu
authors.affiliation: School of Optometry and Ophthalmology and Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China; Key Laboratory of Vision Science, Ministry of Health P.R. China, Wenzhou, Zhejiang, China.
authors.forename: Yifan
authors.initials: Y
authors.lastname: Feng
authors.affiliation: School of Optometry and Ophthalmology and Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Shishi
authors.initials: S
authors.lastname: Lin
authors.affiliation: School of Optometry and Ophthalmology and Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China; Key Laboratory of Vision Science, Ministry of Health P.R. China, Wenzhou, Zhejiang, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.affiliation: School of Optometry and Ophthalmology and Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China; Key Laboratory of Vision Science, Ministry of Health P.R. China, Wenzhou, Zhejiang, China. Electronic address: wqm6@mail.eye.ac.cn.
authors.forename: Qinmei
authors.initials: Q
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D019781:Corneal Topography / Q000295:instrumentation* / Q000379:methods; D003936:Diagnosis, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D008297:Male; D010783:Photometry / Q000295:instrumentation* / Q000379:methods; D012030:Refractive Errors / Q000175:diagnosis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence / Q000295:instrumentation* / Q000379:methods; D055815:Young Adult
keywords: Keratometry; Optical low coherence reflectometry; Topography; White-to-white