Enviaments recents

  • Visual acuity assessment in phakic and pseudophakic eyes under red, green, and blue illumination 

    Clavé Cerezo, Laura; Torrents Gómez, Aurora; Rallo Capdevila, Miguel; Millán Garcia-Varela, M. Sagrario (2020-12-31)
    Article
    Accés obert
    Purpose: To assess the impact of the quasi-monochromatic illumination on visual acuity (VA) in phakic and monofocal pseudophakic eyes using different wavelengths. Methods: Sixty-one eyes classified in two groups (phakic ...
  • Occlusion and noise tests on the encrypted image produced by a security system based on a joint transform correlator and the Fresnel transform 

    Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (Institute of Physics (IOP), 2019-06)
    Article
    Accés obert
    In this work, the occlusion and noise test on the encrypted image produced by a joint transform correlator-based encryption system in the Fresnel domain (FrD) are computed and presented, in order to check the performance ...
  • Optical technologies for the improvement of skin cancer diagnosis: a review 

    Rey Barroso, Laura; Peña Gutiérrez, Sara; Yáñez Alvarado, Carlos René; Burgos Fernández, Francisco Javier; Vilaseca Ricart, Meritxell; Royo Royo, Santiago (Multidisciplinary Digital Publishing Institute (MDPI), 2021-01-02)
    Article
    Accés obert
    The worldwide incidence of skin cancer has risen rapidly in the last decades, becoming one in three cancers nowadays. Currently, a person has a 4% chance of developing melanoma, the most aggressive form of skin cancer, ...
  • Equivalence of two optical quality metrics to predict the visual acuity of multifocal pseudophakic patients 

    Armengol Cebrian, Jesús; Garzon, Nuria; Vega Lerín, Fidel; Altemir Gómez, I.; Millán Garcia-Varela, M. Sagrario (2020-05-01)
    Article
    Accés obert
    This article studies the relationship between two metrics, the area under the modulation transfer function (MTFa) and the energy efficiency (EE), and their ability to predict the visual quality of patients implanted with ...
  • Gamification, serious games and action video games in optometry practice 

    Argilés Sans, Marc; Asensio Jurado, Laura; Quevedo Junyent, Luisa Jesús (Elsevier, 2020-01-06)
    Article
    Accés obert
  • Spectroscopic evaluation of red blood cells of thalassemia patients with confocal microscopy: a pilot study 

    Rey Barroso, Laura; Roldan, Monica; Burgos Fernández, Francisco Javier; Gassiot Riu, Susanna; Ruiz Llobet, Anna; Isola, Ignacio; Vilaseca Ricart, Meritxell (Multidisciplinary Digital Publishing Institute (MDPI), 2020)
    Article
    Accés obert
    Hemoglobinopathies represent the most common single-gene defects in the world and pose a major public health problem, particularly in tropical countries, where they occur with high frequency. Diagnosing hemoglobinopathies ...
  • Experimental optical encryption scheme for the double random phase encoding using a nonlinear joint transform correlator 

    Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (2020-09-01)
    Article
    Accés restringit per política de l'editorial
    We present a new experimental system for optical encryption using a nonlinear joint transform correlator (JTC) to implement the optical security technique of the double random phase encoding (DRPE). The DRPE, which is ...
  • Tear osmolarity and ocular changes in pterygium 

    Julio Morán, Gemma; Lluch Margarit, Sara; Pujol Vives, Pere; Alonso Perez, Silvia; Merindano Encina, M. Dolores (2012-12)
    Article
    Accés restringit per política de l'editorial
    Purpose: To determine abnormalities in tear osmolarity (TO), tear function, and impression cytology in patients with pterygium and to assess the relationship between the variables. Methods: Thirty eyes from 30 patients ...
  • Geometric model and calibration method for a solid-state LiDAR 

    García Gómez, Pablo; Royo Royo, Santiago; Rodrigo Arcay, Noel; Casas Pla, Josep Ramon (Multidisciplinary Digital Publishing Institute (MDPI), 2020-05-20)
    Article
    Accés obert
    This paper presents a novel calibration method for solid-state LiDAR devices based on a geometrical description of their scanning system, which has variable angular resolution. Determining this distortion across the entire ...
  • New cost-effective sensor for the characterization of automotive headlamps by measurements in the near field 

    Royo Royo, Santiago; Arranz, María Jesús; Arasa, Josep; Cattoen, Michel; Bosch, Thierry (Elsevier, 2006-12-01)
    Article
    Accés obert
    Nowadays, European Normative regarding headlamp validation evaluates the photometric distribution of the source as a series of illumination values measured at a plane placed 25 m away from the light source. An innovative ...
  • Micrometric noncontact profiler for optical quality surfaces 

    Royo Royo, Santiago; Arasa, Josep; Caum Aregay, Jesús (2001-12-01)
    Article
    Accés restringit per política de l'editorial
    A non-contact technique for obtaining accurate profiles of optical qualitysurfaces with micrometric accuracy has been developed. The technique isbased on the Ronchi test principle, that is, on the study of the interaction ...
  • Texture evaluation of automotive coatings by means of a gonio-hyperspectral imaging system based on light-emitting diodes 

    Burgos Fernández, Francisco Javier; Pujol Ramo, Jaume; Perales Romero, Esther; Martínez Verdú, Francisco Miguel; Vilaseca Ricart, Meritxell (Multidisciplinary Digital Publishing Institute (MDPI), 2020-03-27)
    Article
    Accés obert
    Sparkle and graininess are textural effects that appear as intrinsic spatial features of coatings containing goniochromatic pigments, whereas others such as mottling are undesired outcomes. In this study, we present new ...

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