Browsing by Contributor "Pujol Ramo, Jaume"
Now showing items 1-20 of 41
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Agreement of 4 pupillometers under 3 different illumination conditions
(Universitat Politècnica de Catalunya, 2015-09-09)
Master thesis
Open AccessAbstract. Pupil diameter is an important parameter to be taken into account for numerous processes, such as in refractive surgery where the size of the ablation zone is partially determined by the pupil size in certain ... -
Calidad óptica ocular en ojos sometidos a cirugía refractiva y afecciones patológicas
(Universitat Politècnica de Catalunya, 2016-01-29)
Doctoral thesis
Open AccessThis 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 ... -
Clinical validation of a fast binocular subjective refraction algorithm
(Universitat Politècnica de Catalunya, 2017-09-08)
Master thesis
Restricted access - author's decisionThe purpose of this study is to investigate a new algorithm to perform an automated non-cycloplegic refraction in adults. In order to carry on the study fifty healthy subjects were measured twice (test-retest) with the new ... -
Comparison of fusional reserves measured with a 3D virtual reality system and conventional clinical methods
(Universitat Politècnica de Catalunya, 2018-06-14)
Bachelor thesis
Open AccessLa mesura de les reserves fusionals és important per avaluar la funció visual dels pacients i diagnosticar possibles disfuncions de la visió binocular, com la insuficiència de convergència. Aquestes mesures es poden fer ... -
Comparison of the amplitude of accommodation measured with a 3D system of virtual reality and with conventional clinical methods
(Universitat Politècnica de Catalunya, 2019-01-25)
Bachelor thesis
Open AccessAquest estudi compara l'amplitud d'acomodació proporcionada per una màquina de realitat virtual amb els mètodes convencionals de clínica Donders i Sheard. L'estudi va incloure 25 subjectes sans (16 dones i 9 homes). L'edat ... -
Comportament de la dinàmica d'acomodació durant processos subjectius de refracció
(Universitat Politècnica de Catalunya, 2019-06-12)
Bachelor thesis
Restricted access - author's decision -
Desarrollo de un sistema de doble paso compacto y de bajo coste para la evaluación de la calidad óptica y la difusión intraocular
(Universitat Politècnica de Catalunya, 2015-12-02)
Doctoral thesis
Open AccessThe 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 ... -
Development and clinical applications of a whole anterior segment and retinal SS-OCT
(Universitat Politècnica de Catalunya, 2023-03-24)
Doctoral thesis
Open Access(English) Vision is central to human perception. It emanates from a complex organ, the human eye, starting from photodetection in the retina. However, the quality of the visual experience depends on the anatomical integrity ... -
Development of a new multispectral imaging system consisting of a liquid crystal tunable filter
(Universitat Politècnica de Catalunya, 2013-09-05)
Master thesis
Open Access[ANGLÈS] The aim of this study was to develop a new portable multispectral system basically composed of a monochrome digital camera, a liquid crystal tunable filter (LCTF) and a laptop. The system had a high spatial ... -
Development of new methodologies for the clinical, objective and automated evaluation of visual function based on the analysis of ocular movements : application in visual health
(Universitat Politècnica de Catalunya, 2019-05-24)
Doctoral thesis
Open AccessHealthy visual function not only relies on good visual acuity. Other systems such as accommodation or binocular vision need to be effective. Binocular vision is the ability of the visual system to coordinate and integrate ... -
Diseño de un colorímetro triestímulo a partir de una cámara CCD-RGB
(Universitat Politècnica de Catalunya, 2001-11-23)
Doctoral thesis
Open AccessUn dispositivo de captura (escáner o cámara) de imágenes digitales no es un instrumento de medida del color como un espectrofotómetro o un tele-espectrocolorímetro. Aunque codifica la información espectral contenida en una ... -
Diseño e implementación de un sistema multiespectral en el rango ultravioleta, visible e infrarrojo : aplicación al estudio y conservación de obras de arte
(Universitat Politècnica de Catalunya, 2014-03-25)
Doctoral thesis
Open AccessMultispectral 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 ... -
Effect of stimulus unpredictability in time and magnitude on the vergence system
(Universitat Politècnica de Catalunya, 2018-09-29)
Master thesis
Restricted access - author's decisionPurpose: To study the influence of stimulus predictability (in magnitude and time) and subject?s expertise in vergence facility test in vergence latency times. Methods: Twenty-seven asymptomatic patients were evaluated ... -
Effect of the field of view and semantic content of the stimulus on accommodation stimulated with a volumetric Badal optometer
(Universitat Politècnica de Catalunya, 2015-07-19)
Master thesis
Open AccessPurpose: To investigate the effects of different field of view (FOV) and semantic content of the stimulus on accommodation stimulated with a volumetric Badal optometer and to compare these results with natural-viewing ... -
Evaluation of human binocular function with an eye-tracker
(Universitat Politècnica de Catalunya, 2017-09-08)
Master thesis
Open AccessThis study was designed to investigate if the velocity of the stimulus used during the near point of convergence (NPC) exam affected the performance of the vergence system. The effects of target’s distance and ocular ... -
Exploring the relationship between visual acuity and contrast threshold through defocus
(Universitat Politècnica de Catalunya, 2015-07-19)
Master thesis
Open AccessIn optometry and more generally in vision research, the measure of visual acuity (VA) is the most extended way to evaluate and obtain psychophysical information about the quality of the vision. VA is a measure of the eye?s ... -
Gonio-hyperspectral imaging system based on light-emitting diodes for the analysis of automotive coatings
(Universitat Politècnica de Catalunya, 2016-12-19)
Doctoral thesis
Open AccessGoniochromatic 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 ... -
Influencia del astigmatismo refractivo en la calidad óptica ocular en pacientes con cataratas
(Universitat Politècnica de Catalunya, 2015-05-28)
Master thesis
Open AccessLa primera causa de pérdida de visión en el mundo es debido a la catarata, induce una disminución de la función visual debido a una opacificación del cristalino. En las consultas oftalmológicas se diagnostican las cataratas ... -
Lens-based technologies to study accommodation and refraction
(Universitat Politècnica de Catalunya, 2018-01-19)
Doctoral thesis
Open AccessA 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, ... -
Medida de la respuesta acomodativa con un sistema de doble paso: aplicación al estudio de la acomodación en función de la edad.
(Universitat Politècnica de Catalunya, 2012-10-22)
Doctoral thesis
Open AccessAccommodation, defined as the dioptric change of the eye, enables clear vision at different distances. Its study is interesting due to different aspects: the progressive loss of amplitude of accommodation known as presbyopia, ...
