Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 494 results
  • Age-related changes in accommodation measured with a double-pass system

     Aldaba Arevalo, Mikel; Vilaseca Ricart, Meritxell; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    Ophthalmic and physiological optics
    Vol. 33, num. 4, p. 508-515
    DOI: 10.1111/opo.12038
    Date of publication: 2013-07
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    To measure the accommodative response in a wide age range population using the retinal image quality assessments provided by a double-pass system.

  • Access to the full text
    Non-cycloplegic spherical equivalent refraction in adults: comparison of the double-pass system, retinoscopy, subjective refraction and a table-mounted autorefractor  Open access

     Vilaseca Ricart, Meritxell; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume; Peris March, Maria Elvira; Martínez Rodríguez, Vanessa
    International Journal of Ophthalmology
    Vol. 6, num. 5, p. 618-625
    DOI: 10.3980/j.issn.2222-3959.2013.05.12
    Date of publication: 2013-10-18
    Journal article

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    AIM: To evaluate the accuracy of spherical equivalent (SE) estimates of a double pass system and to compare it with retinoscopy, subjective refraction and a table mounted autorefractor. METHODS: Non cycloplegic refraction was performed on 125 eyes of 65 healthy adults (age 23.5 +/- 3.0 years) from October 2010 to January 2011 using retinoscopy, subjective refraction, autorefraction (Auto kerato - refractometer TOPCON KR-8100, Japan) and a double pass system (Optical Quality Analysis System, 0QAS, Visiometrics S.L., Spain). Nine consecutive measurements with the double -pass system were performed on a subgroup of 22 eyes to assess repeatability. To evaluate the trueness of the 0QAS instrument, the SE laboratory bias between the double - pass system and the other techniques was calculated. RESULTS: The SE mean coefficient of repeatability obtained was 0.22D. Significant correlations could be established between the OQAS and the SE obtained with retinoscopy (r=0.956, P<0.001), subjective refraction(r = 0.955, P<0.001) and autorefraction (r=0.957, P<0.001). The differences in SE between the double pass system and the other techniques were significant (P<0.001), but lacked clinical relevance except for retinoscopy; Retinoscopy gave more hyperopic values than the double pass system 0.51 0.500 as well as the subjective refraction 0.23 0.50D; More myopic values were achieved by means of autorefraction 0.24 0.49D. CONCLUSION: The double -pass system provides accurate and reliable estimates of the SE that can be used for clinical studies. This technique can determine the correct focus position to assess the ocular optical quality. However, it has a relatively small measuring range in comparison with autorefractors (-8.00 to +5.00D), and requires prior information on the refractive state of the patient.

  • Evaluation of an autorefractor for over-refraction with multifocal contact lenses patients

     Giner Tort, Anna; Aldaba Arevalo, Mikel; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    Association for Research in Vision and Ophthalmology Annual Meeting
    Presentation's date: 2013-05-09
    Presentation of work at congresses

    Read the abstract Read the abstract  Share Reference managers Reference managers Open in new window

    Non-cyclopegic distance refractive error was measured in patients wearing multifocal contact lenses by means of the Grand Seiko Auto Ref/Keratometer WAM-5500 auto-refractometer and compared with subjective measurements. Three commercial multifocal contact lenses were evaluated: Air Optix Multifocal, Ciba Vision (refractive bi-aspheric lens with near vision in the centre), Proclear Multifocal, CooperVision (refractive lens with aspheric centre with near vision in it), Acuvue Oasys Multifocal, Johnson & Johnson (refractive lens with a multicurve design). 30 eyes of 15 healthy adults were measured in the study. The results of over-refraction were evaluated in terms of M, J0 and J45. The mean difference between auto-refractometer and subjective spherical over-refraction was 0.52 ± 0.37D (range: +1.08 to +0.02D) for the Air Optix lens, 0.62 ± 0.43D (range: +0.94 to +0.32D) for the Proclear lens and -0.15 ± 0.11D (range: +0.07 to -0.46D) for the Acuvue Oasys lens. The mean differences in astigmatic over-refraction in terms of J0 and J45 were -0.04 ± 0.03D (range: +0.32 to -0.55) and -0.05 ± 0.04D (range: +0.15 to -0.31D) for the Air Optix lens, 0.17 ± 0.07D (range: +0.22 to +0.12D) and 0.05 ± 0.04D (range: +0.42 to -0.33D) for the Proclear lens and -0.23 ± 0.17D (range: +0.03 to -0.50D) and -0.05 ± 0.03D (range: +0.17 to -0.29D) for the Acuvue Oasys lens. We have measured the over-refraction in multifocal contact lenses users with an auto-refractometer and compared with subjective over-refraction. The results from our measurements highlighted a good agreement between subjective and objective values in both spherical and cylindrical refractions, although some discrepancies were found on patients with high refractive errors. Thus, we can conclude that auto-refractor is a useful tool for over-refraction in patients wearing multifocal contact lenses although care must be taken in highly myopic or hyperopic users.

  • Measurement of the intraocular scattering in cataractous patients, using different instruments and parameters. Comparative study

     Ondategui Parra, Juan Carlos; Mateos Pena, Lorena; Martinez Roda, Juan Antonio; Arjona Carbonell, Maria Montserrat
    Association for Research in Vision and Ophthalmology Annual Meeting
    Presentation's date: 2013-05-04
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Optical quality after myopic photorefractive keratectomy and laser in situ keratomileusis: Comparison using a double-pass system

     Ondategui Parra, Juan Carlos; Vilaseca Ricart, Meritxell; Arjona Carbonell, Maria Montserrat; Montasell, Ana; Cardona Torradeflot, Genis; Güell, José L.; Pujol Ramo, Jaume
    Journal of cataract and refractive surgery
    Vol. 38, num. 1, p. 16-27
    DOI: 10.1016/j.jcrs.2011.07.037
    Date of publication: 2012
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Measuring the accommodative response with a double-pass system: comparison with the Hartmann-Shack technique  Open access

     Aldaba Arevalo, Mikel; Vilaseca Ricart, Meritxell; Diaz Douton, Fernando; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    Vision research
    Vol. 62, p. 26-34
    Date of publication: 2012-04
    Journal article

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Grading nuclear, cortical and posterior subcapsular cataracts using an objective scatter index measured with a double-pass system

     Vilaseca Ricart, Meritxell; Romero Vallés, M.José; Arjona Carbonell, Maria Montserrat; Luque, Sergio Oscar; Ondategui Parra, Juan Carlos; Salvador Playà, A.; Güell, José L.; Artal, Pablo; Pujol Ramo, Jaume
    British journal of ophthalmology
    Vol. 96, num. 9, p. 1204-1210
    DOI: 10.1136/bjophthalmol-2011-301055
    Date of publication: 2012-09
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Optics of astigmatism and retinal image quality  Open access

     Vilaseca Ricart, Meritxell; Diaz Douton, Fernando; Luque, Sergio Oscar; Aldaba Arevalo, Mikel; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    Date of publication: 2012-02
    Book chapter

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    In the first part of this chapter, the optical condition of astigmatism is defined. The main causes and available classifications of ocular astigmatism are briefly described. The most relevant optical properties of image formation in an astigmatic eye are analysed and compared to that of an emmetropic eye and an eye with spherical ametropia. The spectacle prescription and axis notation for astigmatism are introduced, and the correction of astigmatism by means of lenses is briefly described. The formation of the retinal image for extended objects and the related blurring are also analysed, and the real limits of tolerance of uncorrected astigmatism are provided. Simulations of retinal images in astigmatic eyes, obtained by means of commercial optical design software, are also presented. Finally, the clinical assessment of retinal image quality by means of wavefront aberrometry and double-pass systems in eyes with astigmatism is presented, and current trends in research related to this topic are highlighted.

  • Cuantificación de la imagen visual de dos envases de patatas fritas

     Arjona Carbonell, Maria Montserrat; Burgos Fernandez, Francisco Javier
    Date: 2012-01-27
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de dos envases de gel de ducha

     Arjona Carbonell, Maria Montserrat; Burgos Fernandez, Francisco Javier
    Date: 2012-07-17
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de envases de preservativos

     Arjona Carbonell, Maria Montserrat; Burgos Fernandez, Francisco Javier
    Date: 2012-11-13
    Report

     Share Reference managers Reference managers Open in new window

  • Medida de la respuesta acomodativa con un sistema de doble paso. Aplicación al estudio de la acomodación en función de la edad.  Open access

     Aldaba Arevalo, Mikel
    Department of Optics and Optometry, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Accommodation, 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, the recent interest in accommodative restauration techniques in pseudophakic patients, its possible relation to myopia development and the associated pathologies. The most widely used techniques to measure accommodation are the subjectives, although it has been shown that they overestimate accommodation due to pseudoaccommodation. There are also several objective techniques as retinoscopy, autorefractometers or aberrometers. In the last years it has been suggested that a more realistic accommodative measurement is done when all the aberrations of the eye are taken into acount, and not just defocus. The goal of this thesis has been to develop a method based on the double pass technique for the accommodative response measurement and its application to the study of accommodation with age. Double pass technique is based on projecting a point source on the retina and recording images after retinal reflection and double pass through the ocular media. This technique provides information about the optical quality of the eye and takes into acount all the factors influencing the retinal image quality, thus it is ideal for being applied in the measurement of tha accommodative response. In the first part of the thesis the method for the accommodative response measurement based on double pass technique has been developed and it has been validated by comparison with Hartmann-Shack measurements. The developed experimental setup combines both techniques, double pass and Hartmann-Shack, and it is specifically designed for accommodative response measurements, including elements like the open field fixation test that allows a more natural accommodative stimulation. The method developed is based on finding the vergence that maximizes the quality of the double pass image. Several double pass images are recorded by means of an axial scanning and the vergence of the best double pass image is related to accommodative response. Double pass measurements showed a good agreement with Hartmann-Shack measurements and no statistically significant differences, thus validating our method. In the second part of the thesis, the method has been applied for the study of the accommoditve response in a wide age range population. The accommodative response measured in young patients was higher than the published in the literature, due to our measurements being based on the retinal image quality and not on defocus. While in older patients, the accommodative response measurements are in good agreement with previous works. The accommodative stimulus-response curve and its slope also showed a worsening with age, with a more noticeable change in the accommodation after the age of 35-40 years. The work done during the thesis led to articles in journals and several contributions to congresses, as well as to a patent being comercially exploited.

    La acomodación, cambio dióptrico del ojo, permite una visión nítida a diferentes distancias. El interés que despierta su estudio es grande debido a diferentes factores: la progresiva pérdida de acomodación con la edad, la restauración de la acomodación en pacientes pseudfáquicos, su posible relación con el desarrollo de la miopía y las patologías asociadas a la acomodación. Aunque las técnicas más habituales para la medida de la acomodación son las técnicas subjetivas, presentan el problema de sobrevalorar la amplitud de acomodación debido a la pseudoacomodación, rango en el que sin cambio dióptrico del cristalino se ve nítidamente gracias a la profundidad de foco. Entre las objetivas se han propuesto diversas técnicas como la retinoscopía, autorrefractómetros o aberrómetros. En los últimos años se ha sugerido que una correcta medida de la acomodación no sólo debería tener en cuenta el desenfoque si no el global de las aberraciones que afectan a la calidad de la imagen retiniana. El objetivo de esta tesis ha sido desarrollar un nuevo método para la medida de la respuesta acomodativa basado en la técnica de doble paso y su aplicación al estudio de la acomodación con la edad. La técnica de doble paso consiste en proyectar una fuente puntual de luz en la retina y registrar la imagen formada tras su reflexión en la retina y doble paso por los medios oculares. Esta técnica da información acerca de la calidad óptica del ojo y tiene en cuenta los dos factores que afectan básicamente a la calidad de la imagen retiniana: aberraciones y difusión intraocular, lo que la convierte en una candidata ideal para su aplicación en la medida de la respuesta acomodativa. En la primera parte de la tesis se ha desarrollado un método y un montaje para la medida de la respuesta acomodativa con un sistema de doble paso y se ha validado mediante comparación con medidas realizadas con un aberrómetro de Hartmann-Shack. El montaje experimental desarrollado combina ambas técnicas, doble paso y Hartmann-Shack, y además está optimizado para la medida de la respuesta acomodativa con un test de fijación de campo abierto que permite una estimulación de la acomodación más natural que los test internos. El método desarrollado se basa en hallar la vergencia de la luz que maximiza la calidad de la imagen de doble paso. Para ello se registran diversas imágenes de doble paso correspondientes a diferentes vergencias de la luz y la de mayor calidad se relaciona con la respuesta acomodativa. Las medidas realizadas con el sistema de doble paso se han comparado con medidas simultáneas realizadas con un aberrómetro de Hartmann-Shack, obteniendo resultados similares con ambas técnicas. Una vez validado el método para la medida de la respuesta acomodativa con el sistema de doble paso, se ha aplicado al estudio de los cambios en la acomodación con la edad realizando medidas en una población extensa con un rango amplio de edad. La respuesta acomodativa medida en los pacientes jóvenes es mayor que en otros trabajos, básicamente debido a que la técnica empleada está basada en la calidad de la imagen retiniana y no en el desenfoque como sucede en los otros estudios. Mientras que en pacientes mayores, los resultados concuerdan con los de otros estudios. La curva de estímulo-respuesta acomodativa y su pendiente muestran un empeoramiento con la edad, observándose que la edad que marca los cambios más notables está en torno a los 35-40 años. El trabajo realizado durante el desarrollo de la tesis ha dado lugar a publicaciones en revistas y diversas contribuciones a congresos, así como una patente actualmente explotada comercialmente.

  • NUEVOS DESARROLLOS EN OPTICA VISUAL, VISION Y SISTEMAS HIPERESPECTRALES: APLICACIONES CLINICAS E INDUSTRIALES

     Arjona Carbonell, Maria Montserrat; Vilaseca Ricart, Meritxell; Ondategui Parra, Juan Carlos; Martinez Roda, Juan Antonio; Herrera, Jorge Alexis; Pujol Ramo, Jaume
    Competitive project

     Share

  • Colour and Space in cultural Heritage (COSCH)

     Royo Royo, Santiago; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Ares Rodriguez, Miguel; Arjona Carbonell, Maria Montserrat; Herrera Ramirez, Jorge Alexis
    Competitive project

     Share

  • Double-pass accommodative response measurements in a wide age range population

     Pujol Ramo, Jaume; Aldaba Arevalo, Mikel; Vilaseca Ricart, Meritxell; Diaz Douton, Fernando; Arjona Carbonell, Maria Montserrat
    Association for Research in Vision and Ophthalmology Annual Meeting
    Presentation's date: 2012-05
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Measuring accommodative response with a double-pass system

     Aldaba Arevalo, Mikel; Vilaseca Ricart, Meritxell; Diaz Douton, Fernando; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    European Meeting on Visual and Physiological Optics
    p. 47
    Presentation's date: 2012-08-22
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Trabajos de investigación en óptica visual y tecnología del color en el CD6

     Pujol Ramo, Jaume; Arjona Carbonell, Maria Montserrat; Vilaseca Ricart, Meritxell; Aldaba Arevalo, Mikel; Diaz Douton, Fernando; Luque, Sergio Oscar; Zuluaga Duque, Harold; Herrera Ramirez, Jorge Alexis; Sanabrial, F.; Ferrer Serrano, Edgar; Martinez Roda, Juan Antonio; Ondategui Parra, Juan Carlos; Burgos, Francisco Javier; Giner Tort, Anna; Torrecilla Ribalta, Elena
    Reunión Nacional de Óptica
    Presentation's date: 2012-09-05
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Medida de la respuesta acomodativa con un sistema de doble paso

     Aldaba Arevalo, Mikel; Vilaseca Ricart, Meritxell; Diaz Douton, Fernando; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    Reunión Nacional de Óptica
    Presentation's date: 2012-09-06
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Método para la detección de pérdidas de función visual

     Pujol Ramo, Jaume; Ondategui Parra, Juan Carlos; Vilaseca Ricart, Meritxell; Arjona Carbonell, Maria Montserrat; Borras Garcia, M. Rosa
    Date of request: 2012-05-04
    Invention patent

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Método para la detección de pérdidas de función visual.

    Comprende analizar la calidad óptica de un ojo de un paciente a partir de una o más imágenes retinianas del mismo, o de información relacionada con imágenes retinianas, correspondientes a un ojo con un segmento anterior y unos medios intraoculares sanos, comprendiendo el método detectar, en función del resultado del análisis, una pérdida de función visual de etiología funcional o patológica del sistema visual, y determinar que ésta es debida a una respuesta neural reducida y/o limitada, que induce alteraciones en la inervación de la musculatura intrínseca ocular del ojo.

  • Access to the full text
    Task oriented visual satisfaction and wearing success with two different simultaneous vision multifocal soft contact lenses  Open access

     Gispets Parcerisas, Joan; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume; Vilaseca Ricart, Meritxell; Cardona Torradeflot, Genis
    Journal of Optometry
    Vol. 4, num. 3, p. 76-84
    DOI: 10.1016/S1888-4296(11)70046-2
    Date of publication: 2011
    Journal article

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Retinal image quality three months after photorefractive keratectomy for myopia of up to -5.75 Diopters

     Ondategui Parra, Juan Carlos; Vilaseca Ricart, Meritxell; Arjona Carbonell, Maria Montserrat; Boniquet, Sandra; Cardona Torradeflot, Genis; Güell, José L.; Pujol Ramo, Jaume
    Journal of Emmetropia
    Vol. 2, num. 1, p. 21-30
    Date of publication: 2011
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Iris Color and Texture: A Comparative Analysis of Real Irises, Ocular Prostheses, and Colored Contact Lenses

     Herrera Ramirez, Jorge Alexis; Vilaseca Ricart, Meritxell; Düll, Jochen; Arjona Carbonell, Maria Montserrat; Torrecilla Ribalta, Elena; Pujol Ramo, Jaume
    Color research and application
    Vol. 36, num. 5, p. 373-382
    DOI: 10.1002/col.20635
    Date of publication: 2011-10
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Use of light-emitting diodes in multispectral systems design: variability of spectral power distribution according to angle and time of usage

     Martínez, Oscar; Vilaseca Ricart, Meritxell; Arjona Carbonell, Maria Montserrat; Pizarro Bondia, Carlos; Pujol Ramo, Jaume
    Journal of imaging science and technology
    Vol. 55, num. 5, p. 050501-1-050501-8
    DOI: 10.2352/J.ImagingSci.2011.55.5.050501
    Date of publication: 2011
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Multispectral systems allow the spectral and color characterization of objects using images obtained from several acquisition channels with different spectral sensitivities. Light sources based on light-emitting diodes have started to be used in multispectral systems, mainly to develop low-cost devices for the industry. In this study, the authors examine the variability of spectral power distribution according to the viewing angle of white and single color light-emitting diodes, which can have a significant impact on spectral and color accuracy. This must be taken into account if they are to be used in multispectral systems design. The spectrum drift according to the time of usage of white light-emitting diodes is also analyzed.

  • Luminance adaptation model for increasing the dynamic range of an imaging system based on a CCD camera

     de Lasarte, Marta; Arjona Carbonell, Maria Montserrat; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume
    Optik
    Vol. 122, num. 15, p. 1367-1372
    DOI: 10.1016/j.ijleo2010.09.011
    Date of publication: 2011-06-01
    Journal article

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de dos envases de ambientador

     Arjona Carbonell, Maria Montserrat
    Date: 2011-03-14
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de dos botellas de licor azul

     Arjona Carbonell, Maria Montserrat
    Date: 2011-05-31
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de dos muestras de cantimploras

     Arjona Carbonell, Maria Montserrat
    Date: 2011-07-25
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de dos envases de colonia

     Arjona Carbonell, Maria Montserrat
    Date: 2011-09-19
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de muestras de colores

     Arjona Carbonell, Maria Montserrat
    Date: 2011-06-30
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de dos envases de desodorante

     Arjona Carbonell, Maria Montserrat
    Date: 2011-09-19
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de dos envases de gel baño

     Arjona Carbonell, Maria Montserrat
    Date: 2011-09-19
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de dos envases de queso blanco

     Arjona Carbonell, Maria Montserrat
    Date: 2011-02-23
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de tres envases de sazonador

     Arjona Carbonell, Maria Montserrat
    Date: 2011-03-13
    Report

     Share Reference managers Reference managers Open in new window

  • NUEVOS DESARROLLOS EN ÓPTICA VISUAL Y TECNOLOGÍA DEL COLOR CON ALTO IMPACTO SOCIAL E INDUSTRIAL

     Pujol Ramo, Jaume; Vilaseca Ricart, Meritxell; Arjona Carbonell, Maria Montserrat; Martinez Roda, Juan Antonio; Ondategui Parra, Juan Carlos; Aldaba Arevalo, Mikel; Zuluaga Duque, Harold; Herrera Ramirez, Jorge Alexis; Ferrer Serrano, Edgar
    Competitive project

     Share

  • Accommodative response measurements based on double pass images

     Aldaba Arevalo, Mikel; Vilaseca Ricart, Meritxell; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    Association for Research in Vision and Ophthalmology Annual Meeting
    Presentation's date: 2011-05
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Effect of laser in situ keratomileusis on vision analyzed using preoperative optical quality

     Vilaseca Ricart, Meritxell; Padilla, Adenay; Ondategui Parra, Juan Carlos; Arjona Carbonell, Maria Montserrat; Güell, José L.; Pujol Ramo, Jaume
    Journal of cataract and refractive surgery
    Vol. 36, num. 11, p. 1945-1953
    DOI: 10.1016/j.jcrs.2010.05.029
    Date of publication: 2010-11
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Intra- and Intersession Repeatability of a Double-Pass Instrument

     Vilaseca Ricart, Meritxell; Peris March, Maria Elvira; Pujol Ramo, Jaume; Borras Garcia, M. Rosa; Arjona Carbonell, Maria Montserrat
    Optometry and vision science
    Vol. 87, num. 9, p. 675-681
    DOI: 10.1097/OPX.0b013e3181ea1ad3
    Date of publication: 2010-09
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Influence of the Number of Samples of the Training Set on Accuracy of Color Measurement and Spectral Reconstruction

     de Lasarte Rigueiro, Marta; Arjona Carbonell, Maria Montserrat; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume
    Journal of imaging science and technology
    Vol. 54, num. 3, p. 1-10
    DOI: 10.2352/J.ImagingSci.Technol.2010.54.3.030501
    Date of publication: 2010-05
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de varios envases de aceitunas

     Arjona Carbonell, Maria Montserrat
    Date: 2010-03-25
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de compañías de telefonía

     Arjona Carbonell, Maria Montserrat
    Date: 2010-06-16
    Report

     Share Reference managers Reference managers Open in new window

  • Cuantificación de la imagen visual de productos lácteos para niños

     Arjona Carbonell, Maria Montserrat
    Date: 2010-07-07
    Report

     Share Reference managers Reference managers Open in new window

  • Nuevos desarrollos en óptica visual y tecnología del color con alto impacto social e industrial (D/023849/09)

     Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Arjona Carbonell, Maria Montserrat; Martinez Roda, Juan Antonio; Ondategui Parra, Juan Carlos
    Competitive project

     Share

  • Red temática en ciencia y tecnología del color (FIS2010-09916-E)

     Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Arjona Carbonell, Maria Montserrat
    Competitive project

     Share

  • Defocus curve of multifocal intraocular lenses measured with a new asymmetric focus double pass system

     Zuluaga Duque, Harold; Diaz Douton, Fernando; Luque, Sergio Oscar; Aldaba Arevalo, Mikel; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    Association for Research in Vision and Ophthalmology Annual Meeting
    Presentation's date: 2010-05-06
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Spectral variability of light-emitting diodes with angle

     Martínez, Óscar; Vilaseca Ricart, Meritxell; Pizarro Bondia, Carlos; Ferrer Serrano, Edgar; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    European Conference on Colour in Graphics, Imaging, and vision
    p. 547-553
    Presentation's date: 2010-06-14
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Multispectral systems allow the spectral characterization of the scene through several acquisition channels with different spectral features. The spectral sampling can be done by using transmittance filters and a white light source or illuminating the scene using light sources with different spectral emission characteristics. Light-emitting diodes based light sources have started to be used in multispectral systems, mainly to develop low-cost devices for the industry. In this study we analyze the spectral power distribution and color variability of white and single color light-emitting diodes relative to the viewing angle, and highlight some aspects that must be taken into account if these light sources want to be used in a multispectral system.

  • Comparison of accommodative response measurements with double pass and Hartmann Shack techniques

     Aldaba Arevalo, Mikel; Arjona Carbonell, Maria Montserrat; Vilaseca Ricart, Meritxell; Antò Roca, Joan; Pujol Ramo, Jaume
    European Meeting on Visual and Physiological Optics
    p. 60-
    Presentation's date: 2010-08
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Utilización de LEDs en sistemas multiespectrales: influencia del ángulo y del tiempo en la emisión espectral

     Martínez, Óscar; Vilaseca Ricart, Meritxell; Pizarro Bondia, Carlos; Arjona Carbonell, Maria Montserrat; Pujol Ramo, Jaume
    Congreso Nacional del Color
    p. 18-21
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Los sistemas multiespectrales permiten la caracterización espectral y colorimétrica de objetos con elevada resolución espacial a partir de la adquisición de la escena a través de varios canales de una cámara con diferente sensibilidad espectral. Recientemente han empezado a utilizarse LEDs (diodo emisor de luz) como fuentes de luz en sistemas de este tipo, principalmente para desarrollar equipos de medida de bajo coste para la industria. En este estudio, ponemos de manifiesto y evaluamos algunas de las consideraciones que deben tenerse en cuenta si quieren utilizarse LEDs en sistemas multiespectrales. Dos aspectos a tener en cuenta tanto en LEDs blancos como de color son la variación de su emisión espectral con el ángulo y el cambio del espectro de la luz emitida con el tiempo de utilización. Estas características no son normalmente especificadas en los catálogos de fabricantes pero deben ser previamente consideradas y corregidas si se quiera desarrollar e implementar un sistema multiestpectral con LEDs, puesto que pueden tener un gran impacto en la exactitud de medida del color y de las propiedades espectrales. En este trabajo de estudian ambos aspectos, y se halla que la temperatura de color de los LEDs blancos disminuye fe forma notable al aumentar el ángulo de observación, siendo este cambio más acusado en LEDs de elevada direccionalidad, es decir, si su patrón de emisión espacial es más estrecho. Sin embargo se observa que la emisión de los LEDs de color es casi invariable con el ángulo. Por otro lado, se pone de manifiesto que el cambio en la emisión espectral de los LEDs blancos con el tiempo, y por tanto su temperatura de color, es menos importante que la variabilidad observada con el ángulo de observación.

  • Desarrollo de un sistema hiperespectral para la medida del color en muestras extensas con patrones especialmente complejos

     Ferrer Serrano, Edgar; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Arjona Carbonell, Maria Montserrat
    Congreso Nacional del Color
    p. 216-219
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Cada vez son más los distintos dispositivos para la medida del color basados en sensores optoelectrónicos de imagen. En los últimos años se ha generalizado el uso de sistemas multiespectrales y, en particular, se han empezado a emplear sistemas hiperespectrales que combinan un sistema espectrográfico con una cámara monocromática capaz de realizar medidas de alta calidad con información espectral y espacial. Además, estos sistemas tienen la ventaja de proporcionar el espectro de cada uno de los píxeles de una línea de la imagen. En este trabajo se presenta el método de puesta a punto y validación de un sistema hiperespectral para fines colorimétricos y aplicados a muestras extensas con patrones especialmente complejos. Para ello se ha desarrollado el software que permite obtener imágenes hiperespectrales de alta calidad y se han aplicado losa algoritmos necesarios para la determinación de los espectros de reflectancia y diferencias de color de las muestras. También se ha validado la incertidumbre del sistema comparando los resultados hallados con los obtenidos con un instrumento de referencia a través de la comparación de curvas de reflectancia espectral. Por último se ha aplicado a la medida de muestras reales extensas con patrones especialmente complejos, concretamente para aplicaciones relacionadas con la industria de la madera.