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Master's Dissertation
DOI
10.11606/D.76.1996.tde-03092010-155309
Document
Author
Full name
Luis Alberto Vieira de Carvalho
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1996
Supervisor
Committee
Castro Neto, Jarbas Caiado de (President)
Bicas, Harley Edison Amaral
Costa, Luciano da Fontoura
Title in Portuguese
Desenvolvimento de um instrumento computadorizado para medida da curvatura da cornea durante o ato cirúrgico.
Keywords in Portuguese
Astigmatismo residual
Ceratografia corneana
Abstract in Portuguese
Neste trabalho foi desenvolvido um novo instrumento para monitoramento computadorizado da curvatura da região central anterior da córnea humana durante cirurgias refrativas. Através da projeção de um anel iluminado na córnea, imagens dos reflexos são digitalizadas e processadas. Algoritmos baseados em técnicas de visão computacional e geometria óptica determinam a curvatura da região central (4mm), com alta precisão e desempenho. Mapas coloridos com códigos de cor em dioptrias (proporcionais ao inverso do raio da curvatura) são gerados para auxiliar o oftalmologista cirurgião no diagnóstico.
Title in English
Development of an computerized instrument for measurement of the curvature of the cornea during surgery.
Keywords in English
Corneal keratography
Residual astigmatism
Abstract in English
We have developed a new instrument for computer-aided monitoring of the central region of the anterior portion of the human cornea during refractive surgeries. By projecting a circular iluminated object on the cornea, reflected images are captured by a CCD, digitezed and processed. Algorithms based on computer vision technics and optical geometry compute the curvature of a 3 to 4 mm region, with righ precision and performance. Color-coded maps based on diopters (proportional to the inverse of the radius of curvature) are generated for ease of diagnose.
 
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Publishing Date
2010-09-16
 
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