Precision and agreement of corneal power measurements obtained using a new corneal topographer OphthaTOP

To evaluate repeatability and reproducibility of anterior corneal power measurements obtained with a new corneal topographer OphthaTOP (Hummel AG, Germany) and agreement with measurements by a rotating Scheimpflug camera (Pentacam HR, Oculus, Germany) and an automated keratometer (IOLMaster, Carl Ze...

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Bibliographic Details
Published in:PloS one 2015-01, Vol.10 (1), p.e109414-e109414
Main Authors: Huang, Jinhai, Savini, Giacomo, Chen, Hao, Bao, Fangjun, Li, Yuanguang, Chen, Haisi, Lu, Weicong, Yu, Ye, Wang, Qinmei
Format: Article
Language:English
Subjects:
Accuracy
Adult
Agreements
Analysis of Variance
Care and treatment
Cataracts
Coefficient of variation
Complications and side effects
Contact lenses
Cornea
Cornea - anatomy & histology
Corneal diseases
Corneal Topography - instrumentation
Corneal Topography - methods
Correlation coefficient
Correlation coefficients
Devices
Diagnosis
Diagnostic Techniques, Ophthalmological - instrumentation
Female
Hospitals
Humans
Laboratories
Male
Medicine and Health Sciences
Middle Aged
Optometry
Parameters
Photography - instrumentation
Photography - methods
Power measurement
Prospective Studies
Reproducibility
Reproducibility of Results
Research and Analysis Methods
Statistical analysis
Tomography
Topography
Young Adult
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Summary:To evaluate repeatability and reproducibility of anterior corneal power measurements obtained with a new corneal topographer OphthaTOP (Hummel AG, Germany) and agreement with measurements by a rotating Scheimpflug camera (Pentacam HR, Oculus, Germany) and an automated keratometer (IOLMaster, Carl Zeiss Meditec, Germany). The right eyes of 79 healthy subjects were prospectively measured three times with all three devices. Another examiner performed three additional scans with the OphthaTOP in the same session. Within one week, the first examiner repeated the measurements using the OphthaTOP. The flat simulated keratometry (Kf), steep K (Ks), mean K (Km), J0, and J45 were noted. Repeatability and reproducibility of measurements were assessed by within-subject standard deviation (Sw), repeatability (2.77 Sw), coefficient of variation (CoV), and intraclass correlation coefficient (ICC). Agreement between devices was assessed using 95% limits of agreement (LoA). Intraobserver repeatability and interobserver and intersession reproducibility of all measured parameters showed a 2.77 Sw of 0.29 diopter or less, a CoV of less than 0.24%, and an ICC of more than 0.906. Statistically significant differences (P
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0109414