Corneal topography reinterpretation through separate analysis of the projected rings
Contribuinte(s) |
Universidad de Alicante. Departamento de Óptica, Farmacología y Anatomía Universidad de Alicante. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías Óptica y Ciencias de la Visión |
---|---|
Data(s) |
18/04/2012
18/04/2012
01/03/2012
01/04/2012
|
Resumo |
Póster presentado en SPIE Photonics Europe, Brussels, 16-19 April 2012. 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. Spanish Ministry pr. FIS2009-05639-ET and BIA2011-22704; G. Valenciana pr. PROMETEO/2011/021 and UA pr. GRE10-09. |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/openAccess |
Palavras-Chave | #Corneal topography #Elliptical scanning #Óptica |
Tipo |
info:eu-repo/semantics/conferenceObject |