Navegando por Palavras-chave "corneal tomography"

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    Application of corneal tomography before keratorefractive procedure for laser vision correction
    (Wiley-V C H Verlag Gmbh, 2016) Luz, Allan [UNIFESP]; Lopes, Bernardo [UNIFESP]; Salomao, Marcela; Ambrosio, Renato [UNIFESP]
    Ectasia after refractive surgery represents a major concern among refractive surgeons. Corneal abnormalities and preexisting corneal ectasia are the most important risk factors. Corneal topography and central corneal thickness are the factors traditionally screening for in refractive surgery candidates. Study of the anterior surface by Placido topography allows for identification of keratoconus before biomicroscopy. However, this is insufficient for the evaluation of pre-operative refractive surgery. There are cases of ectasia after laser in situ keratomilusis (LASIK) without identifiable risk factors such that there is a need to go beyond the corneal surface. A key requirement is quantifying susceptibility to corneal biomechanical instability and progression to ectasia. Tomographic indices derived from elevation maps and pachymetry spatial variation produce a Belin Ambrosio display final D index (BAD-D index), which has shown better results compared to surface curvature indices for detecting very mild forms of ectasia. A logistic regression formula, integrating age, residual stromal bed, and BAD-D (Ectasia Susceptibility Score, ESS) resulted in a significant improvement in accuracy, leading to 100% sensitivity and 94% specificity for detecting susceptible cases. A comprehensive corneal structural analysis based on corneal segmental tomography can detect susceptible corneas, which increases safety for refractive surgery patients. [GRAPHICS] .
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    Dynamic corneal deformation response and integrated corneal tomography
    (Medknow Publications & Media Pvt Ltd, 2018) Salomao, Marcella Q. [UNIFESP]; Hofling-Lima, Ana Luisa [UNIFESP]; Faria-Correia, Fernando; Lopes, Bernardo Teixeira [UNIFESP]; Rodrigues-Barros, Sandra [UNIFESP]; Roberts, Cynthia J.; Ambrosio, Renato, Jr. [UNIFESP]
    Measuring corneal biomechanical properties is still challenging. There are several clinical applications for biomechanical measurements, including the detection of mild or early forms of ectatic corneal diseases. This article reviews clinical applications for biomechanical measurements provided by the Corvis ST dynamic non contact tonometer