Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/118280
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Eigencorneas: application of principal component analysis to corneal topography |
Autor: | Rodríguez, Pablo; Navarro, Rafael CSIC ORCID; Rozema, J. J. | Palabras clave: | Zernike polynomials Corneal topography Principal component analysis Corneal model |
Fecha de publicación: | 2014 | Editor: | John Wiley & Sons | Citación: | Ophthalmic and Physiological Optics 34(6): 667-677 (2014) | Resumen: | [Purpose]: To determine the minimum number of orthonormal basis functions needed to accurately represent the great majority of corneal topographies from a normal population. [Methods]: Principal Component Analysis was applied to the elevation topographies of the anterior and posterior corneal surfaces and central thickness of 368 eyes of 184 healthy subjects. PCA was applied directly to the input elevation data points and after fitting them to Zernike polynomials (up to 8th order, 8 mm diameter). The anterior and posterior surfaces, as well as right eye and left eye data, were analysed both separately and jointly. A threshold based on the amount of explained variance (99%) was applied to determine the minimum number of basis functions (eigencorneas) or degrees of freedom (DoF) in the population. [Results]: The eigenvectors directly obtained from elevation data resemble Zernike polynomials. The separate principal component analysis on the Zernike coefficients of anterior and posterior surfaces yielded 5 and 9 DoF, respectively. An additional reduction to 11 DoF (instead of 15 DoF) was achieved when performing a joint PCA that included both surfaces as well as central thickness. Finally, a further reduction was obtained by pooling right and left eye data together, to only 18 DoF. [Conclusions]: The combination of Zernike fit and Principal Component Analysis yields a strong reduction of dimensionality of elevation topography data, to only 19 independent parameters (18 DoF plus population average), which indicates a high degree of correlation existing between anterior and posterior surfaces, and between eyes. The resulting eigencorneas are especially well suited for practical applications, as they are uncorrelated and orthonormal linear combinations of Zernike polynomials. | URI: | http://hdl.handle.net/10261/118280 | DOI: | 10.1111/opo.12155 | Identificadores: | doi: 10.1111/opo.12155 issn: 0275-5408 e-issn: 1475-1313 |
Aparece en las colecciones: | (ICMA) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
accesoRestringido.pdf | 15,38 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
9
checked on 24-abr-2024
WEB OF SCIENCETM
Citations
9
checked on 23-feb-2024
Page view(s)
250
checked on 23-abr-2024
Download(s)
100
checked on 23-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.