Departament d'Òptica i Optometria: Envíos recientes
Mostrando ítems 21-40 de 58
Development of a new spectral imaging system for the diagnosis of skin cancer
The incidence of skin cancer in Europe, US and Australia has been rising rapidly. Skin cancer accounts for one in three cancers worldwide and a person has 1:25 chance to develop a melanoma, the most aggressive form. Visual ...
Lens-based technologies to study accommodation and refraction
A visual stimulus can be presented in free space or through lens-based systems. Interestingly, it has been reported many times in the past that some subjects have poorer accommodative responses when optically stimulated, ...
The design and implementation of a spectrally tuneable LED-based light sourde : towards a new era of intelligent illumination
Rising population numbers place ever increasing demands on energy resources. A large percentage of the worldwide energy production is reserved for the generation of electricity and a significant portion of the electrical ...
Estudi i desenvolupament d'un nou sistema d'inspecció de stents basat en tècniques de metrologia òptica
Stent quality control is a critical process. Coronary stents have to be inspected 100% so no defective stent is implanted into a human body. We have developed an optical non-contact measurement instrument that provides ...
Nuevas contribuciones para la medida objetiva de la difusión intraocular y su aplicación clínica
Image formation in the retina is the first stage in the visual process (optical stage), which is completed with photoreceptor stimulation and distribution of the generated signals (retinal stage), transmission to the visual ...
Calidad visual en pacientes con implante bilateral y simétrico de lentes intraoculares multifocales
PURPOSE: This thesis presents the results of a prospective, double-blind and randomized clinical trial conducted at the Hospital de Sant Pau i la Santa Creu ofBarcelona.lts main objective was to assess and compare visual ...
Gonio-hyperspectral imaging system based on light-emitting diodes for the analysis of automotive coatings
Goniochromatic pigments, such as automotive coatings, are known by their appearance changes - especially of colour and visual texture - as a function of the angles of illumination and observation; they are classified as ...
Continuous wave frequency modulated optical feedback (CWFM-OF) : theory and applications
Diese Arbeit soll einen Beitrag leisten zur Entwicklung neuer Sensorstrategien, basierend auf Phänomenen der optischer Rückkopplung, in Kombination mit die Intensitätsmodulation des Lasers. Optische Rückkopplung, ein ...
Multimodal eye's optical quality (MEOQ)
Within the visual system, the optics of the eye is responsible for forming images of external objects on the ocular fundus for its photo-reception and neural interpretation. However, the eye is not perfect and its capabilities ...
Calidad óptica ocular en ojos sometidos a cirugía refractiva y afecciones patológicas
This dissertation deals with the evaluation of ocular optical quality in two types of patients. First, are patients who have undergone different surgical techniques of refractive surgery to correct different degrees of ...
Desarrollo de un sistema de doble paso compacto y de bajo coste para la evaluación de la calidad óptica y la difusión intraocular
The purpose of this PhD thesis was to design, implement and validate a low cost compact system based on the double-pass I technique in order to evaluate the viability of its use in the future in optical instrumentation ...
Estratègia 2D per al disseny de reflectors amb facetes de forma lliure
This work can be framed in the field of computer-aided optical systems design and it is a part of a larger project in which automated processes are studied and implemented aiming to reduce the time span that stands between ...
Diseño, estudio y validación de una lente de contacto de gradiente de potencia para controlar la miopía = Design, study and validation of a radial refractive gradient contact lens for myopia control
Myopia is the main cause of vision loss worlwide, with associated ocular pathology risks related to myopia amount. Therefore, interventions directed towards limiting or preventing the progression of myopia are of high ...
Generalized ray tracing method for the calculation of the peripheral refraction induced by an ophthalmic lens
This thesis proposes a method to evaluate and quantify in a precise way the peripheral refraction induced by an ophthalmic lens. The motivation for this work stems from the progression of myopia and its possible causes; ...
Una metodología de selección de iluminantes y diseño de la distribución espectral de fuentes lumínicas para la adecuada exhibición y preservación de obras de arte en museos
In this study a new methodology of evaluation and design of light spectral composition for use in museums is presented. The hypothesis under this doctoral thesis is explained in three parts: a) it is factible to obtain a ...
Caracterización óptica de lentes intraoculares = Optical characterization of intraocular lenses
The optical characterization of an intraocular lens (IOL) provides objective and quantitative information that is essential to fully understand its performance as an implant that replaces the crystalline lens in the human ...
Diseño e implementación de un sistema multiespectral en el rango ultravioleta, visible e infrarrojo : aplicación al estudio y conservación de obras de arte
Multispectral systems have several applications and there are different possible configurations in which they can be implemented. Different characteristics make them useful, but the basic one is the access to spectral ...
Comprehensive retinal image analysis: image processing and feature extraction techniques oriented to the clinical task
Medical digital imaging has become a key element of modern health care procedures. It provides a visual documentation, a permanent record for the patients, and most importantly the ability to extract information about many ...
Adaptive self-mixing interferometry for metrology applications
Among the laser based techniques proposed for metrology applications, classical interferometers offer the highest precision measurements. However, the cost of some of the elements involved and the number of optical components ...
Método de cálculo de desalineamientos en sistemas ópticos. Aplicación mediante redes neuronales.
En aquesta tesis doctoral es presenta un nou mètode per al càlcul de desalineaments en sistemes òptics a partir del front d'ona a la sortida del sistema. El mètode parteix de l'ajust de polinomis de Zernike al front d'ona ...
