Navegando por Palavras-chave "Models, theoretical"

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    Medida da visão em candelas: descrição de uma técnica psicofísica para quantificar intensidade luminosa
    (Consel Brasil Oftalmologia, 2011-03-01) Kronbauer, Airton Leite [UNIFESP]; Schor, Paulo [UNIFESP]; Chamon, Wallace [UNIFESP]; Carvalho, Luis Alberto Vieira de [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Universidade de São Paulo (USP)
    Purpose: To develop a method and a device for vision measurement in candela (cd). Vision measurement studies are important to all visual sciences.Methods: It is a theoretical and experimental study. The details of psychophysical method and device calibration were described. Preliminary tests were performed on volunteers.Results: It is a simple psychophysical test and results are expressed in International System of Units. With this technical description it will be possible to reproduce the experiment in others research centers.Conclusion: The results measured in luminous intensity (cd) are an option for visual studies. These results allow to extrapolate measurements for mathematical models and to simulate data for individual aberrometry effects.
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    Resultados preliminares de um algoritmo para ablação de lente de contato personalizada
    (Consel Brasil Oftalmologia, 2009-03-01) Matos, Luciana de [UNIFESP]; Carvalho, Luis Alberto Vieira de [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Purpose: To develop a computer simulation for customized soft contact lenses in order to correct aberrations of higher order. Methods: Using real data from a patient diagnosed with keratoconus, which were measured using a Hartmann-Shack wavefront sensor, the thickness of the contact lenses that compensate these aberrations as well the numbers of pulses required to ablate the lenses were specifically determined for the patient. Results: The maps of correction are presented and the numbers of pulses are calculated, using a 0.5 mm beam width and a 0.3 mu m ablation depth. Conclusions: The results shown here are promising, but they should be improved so that the ablation in actual physical systems can reach the desired accuracy.