Now showing items 1-14 of 14

  • Binocular open-view system to perform estimations of aberrations and scattering in the human eye 

    García Guerra, Carlos Enrique; Aldaba Arévalo, Mikel; Pujol Ramo, Jaume; Arjona Carbonell, Mª Montserrat (2015-11-10)
    Article
    Open Access
    We present a system that integrates a double-pass (DP) instrument and a Hartmann-Shack (HS) wavefront sensor to provide information not only on aberrations, but also on scattering occurring in the human eye. A binocular ...
  • Method to reduce undesired multiple fundus scattering effects in double-pass systems 

    García Guerra, Carlos Enrique; Martínez Roda, Juan Antonio; Aldaba Arévalo, Mikel; Díaz Douton, Fernando; Vilaseca Ricart, Meritxell; Vohnsen, Brian; Pujol Ramo, Jaume (2019-04-29)
    Article
    Restricted access - publisher's policy
  • Multimodal eye's optical quality (MEOQ) 

    García Guerra, Carlos Enrique (Universitat Politècnica de Catalunya, 2016-07-29)
    Doctoral thesis
    Open Access
    Covenantee:  Karlsruher Institut für Technologie
    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 ...
  • New compact open-field double-pass system with asymmetric focus 

    Giner Tort, Anna; Arjona Carbonell, Mª Montserrat; Díaz Douton, Fernando; Aldaba Arévalo, Mikel; García Guerra, Carlos Enrique; Sanabria Ortega, Fernando Guillermo; Pujol Ramo, Jaume (2018-01-01)
    Article
    Open Access
    Every day more people are using multifocal systems to correct presbyopia, as for example contact lenses or intraocular lenses. As a consequence, the necessity to do an appropriate characterization of their optical quality ...
  • Quantification of forward scattering based on the analysis of double-pass images in the frequency domain 

    Martínez Roda, Juan Antonio; García Guerra, Carlos Enrique; Díaz Douton, Fernando; Pujol Ramo, Jaume; Salvador, Antoni; Vilaseca Ricart, Meritxell (Oxford University Press, 2019-01-01)
    Article
    Open Access
  • Real time 100 GHz MST imaging retina 

    Alonso del Pino, María; Garg, V.; García Guerra, Carlos Enrique; Romeu Robert, Jordi; Llombart, Nuria; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
    A real time tomographic imaging system at 100 GHz based on a retina and Modulated Scattered Technique (MST) is presented in this paper. It consists in applying a low frequency modulation to each probe of an array of antennas ...
  • Reducing speckle in double-pass systems using focus tunable lenses 

    García Guerra, Carlos Enrique; Aldaba Arévalo, Mikel; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume (2014)
    Conference report
    Restricted access - publisher's policy
    Speckle arises in double-pass systems when coherent light is reflected by the retina. Since it degrades the images that are used to characterize the eye, there is special attention in reducing speckle when working with ...
  • Response for light scattered in the ocular fundus from double-pass and Hartmann–Shack estimations 

    García Guerra, Carlos Enrique; Aldaba Arévalo, Mikel; Arjona Carbonell, Mª Montserrat; Díaz Douton, Fernando; Martínez Roda, Juan Antonio; Pujol Ramo, Jaume (2016-10-06)
    Article
    Open Access
    Double-pass (DP) and Hartmann--Shack (HS) are complementary techniques based on reflections of light in the ocular fundus that may be used to estimate the optical properties of the human eye. Under conventional data ...
  • Speckle reduction in double-pass retinal images 

    Halpaap Halpaap, Herbert Donatus; García Guerra, Carlos Enrique; Vilaseca Ricart, Meritxell; Masoller Alonso, Cristina (Nature, 2019-03-14)
    Article
    Open Access
  • Speckle reduction in double-pass retinal images using variable-focus lenses 

    García Guerra, Carlos Enrique; Aldaba Arévalo, Mikel; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume (2015-01-01)
    Article
    Open Access
    Speckle arises in double-pass images when coherent light is scattered by the retina. Since this noise degrades the images that are used to characterize the eye, there is special attention in reducing speckle when working ...
  • Tear film stability assessment by corneal reflex image degradation 

    Aldaba Arévalo, Mikel; Mira Agudelo, Alejandro; Barrera, John Fredy; García Guerra, Carlos Enrique; Pujol Ramo, Jaume (2019-04-01)
    Article
    Restricted access - publisher's policy
  • Tear film stability assessment by corneal reflex image degradation 

    Aldaba Arévalo, Mikel; Mira Agudelo, Alejandro; Barrera, John Fredy; García Guerra, Carlos Enrique; Pujol Ramo, Jaume (2018)
    Conference lecture
    Open Access
    A method for tear film break up measurements based on the degradation of corneal reflex images caused by dry spots is presented. The experimental setup, which is based on recording the corneal reflex image or the first ...
  • Technical improvements applied to a double-pass setup for performance and cost optimization 

    Sanabria Ortega, Fernando Guillermo; Aldaba Arévalo, Mikel; Díaz Douton, Fernando; García Guerra, Carlos Enrique; Pujol Ramo, Jaume (2014-06-01)
    Article
    Open Access
    We have studied the possibility of improving the performance, simplifying, and reducing the cost of a double-pass system by the use of alternative technologies. The system for correcting the spherical correction has been ...
  • X-Band Imaging Retinas 

    García Guerra, Carlos Enrique (Universitat Politècnica de Catalunya, 2010-07)
    Master thesis
    Open Access
    Systems at 10GHz based on the use of horn antennas and slotted-waveguide antennas are studied along this work. The importance of this study relies on the fact that these antennas can be employed for imaging applications ...