Corneal topography reinterpretation through separate analysis of the projected rings
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http://hdl.handle.net/10045/21863
Título: | Corneal topography reinterpretation through separate analysis of the projected rings |
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Autor/es: | Espinosa, Julián | Roig Hernández, Ana Belén | Mas, David | Hernández, Consuelo | Illueca Contri, Carlos |
Grupo/s de investigación o GITE: | Óptica y Ciencias de la Visión |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Óptica, Farmacología y Anatomía | Universidad de Alicante. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías |
Palabras clave: | Corneal topography | Elliptical scanning |
Área/s de conocimiento: | Óptica |
Fecha de creación: | mar-2012 |
Fecha de publicación: | abr-2012 |
Resumen: | We present a new algorithm to process captured images of reflected Placido rings. Up to our knowledge, conventional topographers transform from Cartesian to polar coordinates and vice-versa, thus extrapolating corneal data and introducing noise and image artefacts. Moreover, captured data are processed by the device according to proprietary algorithms and offering a final map of corneal curvature. Corneal topography images consists of concentric rings of approximately elliptical shape. Our proposal consists of considering the information that provides each separate ring. A snake-annealing-like method permits identifying the ring even with discontinuities due to eye-lashes and reflections. By analysing the geometrical parameters of rings (centre, semi-axis and orientation), one can obtain information about small morphological micro-fluctuations and local astigmatisms. These parameters can be obtained with sub-pixel accuracy so the method results of high precision. The method can be easily adapted to work on any topographer, so that it can provide additional information about the cornea at no additional cost. |
Descripción: | Póster presentado en SPIE Photonics Europe, Brussels, 16-19 April 2012. |
Patrocinador/es: | Spanish Ministry pr. FIS2009-05639-ET and BIA2011-22704; G. Valenciana pr. PROMETEO/2011/021 and UA pr. GRE10-09. |
URI: | http://hdl.handle.net/10045/21863 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/conferenceObject |
Revisión científica: | si |
Aparece en las colecciones: | INV - IMAOS+V - Comunicaciones a Congresos, Conferencias, etc. |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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espinosaetal.pdf | 2,38 MB | Adobe PDF | Abrir Vista previa | |
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