Repeatability and reproducibility of a new optical biometer in normal and keratoconic eyes

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dc.authorid, beyza/0000-0001-8845-2287
dc.contributor.authorYagci, Ramazan
dc.contributor.authorGuler, Emre
dc.contributor.authorKulak, Ali Ender
dc.contributor.authorErdogan, Beyza Doganay
dc.contributor.authorBalci, Mehmet
dc.contributor.authorHepsen, Ibrahim Feyzi
dc.date.accessioned2025-10-24T18:09:04Z
dc.date.available2025-10-24T18:09:04Z
dc.date.issued2015
dc.departmentMalatya Turgut Özal Üniversitesi
dc.description.abstractPURPOSE: To evaluate the repeatability and reproducibility of measurements obtained by a new optical biometer (Nidek AL-Scan) in normal eyes and keratoconic eyes. SETTING: Department of Ophthalmology, Turgut ozal University, Medical School, Ankara, Turkey. DESIGN: Evaluation of diagnostic technology. METHODS: To assess the repeatability and reproducibility of the optical biometer, 2 independent examiners performed 3 consecutive measurements. The following parameters were evaluated: central corneal thickness (CCT), anterior chamber depth, axial length (AL), corneal dioptric power in the flattest meridian (flat keratometry [K]) and in the steepest meridian (steep K), and white-to-white (WTW) distance. Repeatability was assessed using the within-subject standard deviation (S-w), repeatability, and precision. Reproducibility was evaluated using the 95% limits of agreement proposed by Bland and Altman. RESULTS: Thirty healthy subjects and 27 patients with keratoconus were evaluated. Both examiners achieved high repeatability for all parameters in each group except for the steep K measurement in keratoconic eyes performed by examiner 2 (S-w = 3.341). The WTW in normal eyes and the CCT and steep K in keratoconic eyes showed less repeatability. In both groups, the smallest range of agreement was in AL measurements whereas the largest was in CCT measurements. In keratoconic eyes, the range of agreement for steep K was also greater (3.766). CONCLUSIONS: The precision of the measurements obtained by the new optical biometer was high.
dc.identifier.doi10.1016/j.jcrs.2014.04.039
dc.identifier.endpage177
dc.identifier.issn0886-3350
dc.identifier.issn1873-4502
dc.identifier.issue1
dc.identifier.pmid25532643
dc.identifier.scopus2-s2.0-84919444095
dc.identifier.scopusqualityQ1
dc.identifier.startpage171
dc.identifier.urihttps://doi.org/10.1016/j.jcrs.2014.04.039
dc.identifier.urihttps://hdl.handle.net/20.500.12899/3457
dc.identifier.volume41
dc.identifier.wosWOS:000347671300026
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherElsevier Science Inc
dc.relation.ispartofJournal Of Cataract And Refractive Surgery
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20251023
dc.subjectPartial Coherence Interferometry; Lens Power Calculation; Clinical Measurement; Statistical-Methods; Scheimpflug Camera; Comparing Methods; Ocular Biometry; Axial Myopia; Agreement; Corneal
dc.titleRepeatability and reproducibility of a new optical biometer in normal and keratoconic eyes
dc.typeArticle

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