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A Concept for the analysis of repeatability and precision of corneal shape measurements
- Source :
- Zeitschrift fur medizinische Physik. 26(2)
- Publication Year :
- 2015
-
Abstract
- We propose a framework for the analysis of the repeatability and precision of corneal elevation and the repeatability of corneal thickness data measured by clinically used topographers and tomographers. The repeatability is given by the standard deviation of different measurements of the same eye for each data point. The differences between measurements can partially be explained by different positions of the eye at each measurement. The precision is given by the standard deviation of the data after correction for displacements (decentration, tilts, rotations). The applicability is demonstrated using measurements of the Pentacam HR [1] (Oculus Optikgerate GmbH, Wetzlar, Germany) Scheimpflug tomographer. It provides anterior corneal elevation data with a precision that was almost limited by the axial resolution of 1μm in the central 6mm zone. This is approximately five times better than the precision of the posterior elevation. The results can be applied to surface approximation of the exported corneal elevation data and give a measure for the goodness of the fit.
- Subjects :
- Adult
Male
Corneal Pachymetry
Scheimpflug principle
Biophysics
Sensitivity and Specificity
Standard deviation
030218 nuclear medicine & medical imaging
Cornea
03 medical and health sciences
0302 clinical medicine
Optics
medicine
Humans
Radiology, Nuclear Medicine and imaging
Computer Simulation
Diagnosis, Computer-Assisted
Pentacam hr
Corneal pachymetry
Mathematics
Observer Variation
Models, Statistical
Radiological and Ultrasound Technology
medicine.diagnostic_test
business.industry
Elevation
Corneal Topography
Reproducibility of Results
Repeatability
Corneal topography
eye diseases
medicine.anatomical_structure
Data Interpretation, Statistical
030221 ophthalmology & optometry
Female
sense organs
business
Algorithms
Subjects
Details
- ISSN :
- 18764436
- Volume :
- 26
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Zeitschrift fur medizinische Physik
- Accession number :
- edsair.doi.dedup.....5debfb40dda9045868843c25cd6b3ad1