http://hdl.handle.net/2117/3394 Fri, 24 May 2013 11:49:46 GMT 2013-05-24T11:49:46Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/19389 Title: Temporal stability in the perception of dry eye ocular disconfort symptoms Authors: Cardona Torradeflot, Genís; Marcellán, Concepción; Fornieles Deu, Albert; Vilaseca Ricart, Meritxell; Quevedo Junyent, Luisa Jesus Abstract: Purpose. A prospective longitudinal study was designed to investigate the ability of patients with tear deficiency to correctly recall their past symptoms. The ultimate goal of the study was to contribute to the ongoing research concerning the lack of association between dry eye symptomatology and clinical tests of tear film evaluation. Methods. A total of 26 subjects with ages ranging from 29 to 61 years participated in the study. All subjects reported symptoms associated with tear deficiency, although none had been diagnosed with dry eye disease. Subjects were instructed to grade their symptoms on two different occasions, at the precise moment they were experiencing them, by means of a home questionnaire, and through a recall questionnaire, which was administered within a maximum interval of 10 days from the first questionnaire. Tear evaluation tests were performed at this second time. Non-parametric statistical analyses were used to investigate the relationship between present and recalled symptoms and between symptoms and signs, as well as between the different dry eye tests. The contributions of age, gender, and recall period were also evaluated. Results. With the exception of irritation (p 0.029) and scratchiness (p 0.025), no statistically significant difference was encountered between home and recall questionnaires, although females were found to recall their symptoms slightly better than males (p 0.048). An increase in the severity of the symptoms was associated with a better recollection (p 0.007). Symptoms (home or recalled) and clinical signs were not correlated, although the recalled symptom of scratchiness presented moderately strong correlations with several dry eye tests. Conclusions. Although the lack of correlation between dry eye tests and symptoms mirrored previous research, symptoms recall was found to follow certain interesting patterns, similar to those published in pain research literature. Fri, 24 May 2013 07:33:54 GMT http://hdl.handle.net/2117/19389 2013-05-24T07:33:54Z Cardona Torradeflot, Genís; Marcellán, Concepción; Fornieles Deu, Albert; Vilaseca Ricart, Meritxell; Quevedo Junyent, Luisa Jesus no Purpose. A prospective longitudinal study was designed to investigate the ability of patients with tear deficiency to correctly recall their past symptoms. The ultimate goal of the study was to contribute to the ongoing research concerning the lack of association between dry eye symptomatology and clinical tests of tear film evaluation. Methods. A total of 26 subjects with ages ranging from 29 to 61 years participated in the study. All subjects reported symptoms associated with tear deficiency, although none had been diagnosed with dry eye disease. Subjects were instructed to grade their symptoms on two different occasions, at the precise moment they were experiencing them, by means of a home questionnaire, and through a recall questionnaire, which was administered within a maximum interval of 10 days from the first questionnaire. Tear evaluation tests were performed at this second time. Non-parametric statistical analyses were used to investigate the relationship between present and recalled symptoms and between symptoms and signs, as well as between the different dry eye tests. The contributions of age, gender, and recall period were also evaluated. Results. With the exception of irritation (p 0.029) and scratchiness (p 0.025), no statistically significant difference was encountered between home and recall questionnaires, although females were found to recall their symptoms slightly better than males (p 0.048). An increase in the severity of the symptoms was associated with a better recollection (p 0.007). Symptoms (home or recalled) and clinical signs were not correlated, although the recalled symptom of scratchiness presented moderately strong correlations with several dry eye tests. Conclusions. Although the lack of correlation between dry eye tests and symptoms mirrored previous research, symptoms recall was found to follow certain interesting patterns, similar to those published in pain research literature. http://hdl.handle.net/2117/18334 Title: One-shot focusing using the entropy as a merit function Authors: Suc, Vicent; Royo Royo, Santiago; Jordan, Andres; Bakos, G.; Penev, K. Fri, 15 Mar 2013 09:45:27 GMT http://hdl.handle.net/2117/18334 2013-03-15T09:45:27Z Suc, Vicent; Royo Royo, Santiago; Jordan, Andres; Bakos, G.; Penev, K. no http://hdl.handle.net/2117/17842 Title: Comparison of B-spline and Zernike fitting techniques in complex wavefront surfaces Authors: Ares Rodríguez, Miguel; Royo Royo, Santiago; Caum Aregay, Jesús; Pizarro Bondia, Carlos Editor: Osten, Wolfgang; Gorecki, Christophe; Novak, Erik L. Mon, 18 Feb 2013 14:47:58 GMT http://hdl.handle.net/2117/17842 2013-02-18T14:47:58Z Ares Rodríguez, Miguel; Royo Royo, Santiago; Caum Aregay, Jesús; Pizarro Bondia, Carlos no http://hdl.handle.net/2117/17831 Title: Application of matched digital filters to noisy fringe-patterns from complex wavefronts Authors: Caum Aregay, Jesús; Arasa Marti, Jose; Royo Royo, Santiago; Ares Rodríguez, Miguel Editor: Osten, Wolfgang; Gorecki, Christophe; Novak, Erik L. Mon, 18 Feb 2013 13:23:04 GMT http://hdl.handle.net/2117/17831 2013-02-18T13:23:04Z Caum Aregay, Jesús; Arasa Marti, Jose; Royo Royo, Santiago; Ares Rodríguez, Miguel no http://hdl.handle.net/2117/17443 Title: Measuring the accommodative response with a double-pass system: Comparison with the Hartmann-Shack technique Authors: Aldaba Arévalo, Mikel; Vilaseca Ricart, Meritxell; Díaz-Doutón, Fernando; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume Mon, 21 Jan 2013 15:11:53 GMT http://hdl.handle.net/2117/17443 2013-01-21T15:11:53Z Aldaba Arévalo, Mikel; Vilaseca Ricart, Meritxell; Díaz-Doutón, Fernando; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume no http://hdl.handle.net/2117/15038 Title: Measure of roughness of paper using speckle Authors: Pino, Abdiel; Pladellorens Mallofré, Josep Thu, 09 Feb 2012 15:02:59 GMT http://hdl.handle.net/2117/15038 2012-02-09T15:02:59Z Pino, Abdiel; Pladellorens Mallofré, Josep no http://hdl.handle.net/2117/14635 Title: Determinación de propiedades superficiales del papel utilizando el análisis de la textura del patrón de speckle Authors: Pladellorens Mallofré, Josep Wed, 18 Jan 2012 10:20:20 GMT http://hdl.handle.net/2117/14635 2012-01-18T10:20:20Z Pladellorens Mallofré, Josep no http://hdl.handle.net/2117/14553 Title: Optical quality after myopic photorefractive keratectomy and laser in situ keratomileusis: Comparison using a double-pass system Authors: Ondategui Parra, Juan Carlos; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Montasell, Ana; Cardona Torradeflot, Genís; Güell, José L.; Pujol Ramo, Jaume Mon, 16 Jan 2012 10:22:55 GMT http://hdl.handle.net/2117/14553 2012-01-16T10:22:55Z Ondategui Parra, Juan Carlos; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Montasell, Ana; Cardona Torradeflot, Genís; Güell, José L.; Pujol Ramo, Jaume no http://hdl.handle.net/2117/14446 Title: Use of light-emitting diodes in multispectral systems design: variability of spectral power distribution according to angle and time of usage Authors: Martínez, Oscar; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Pizarro Bondia, Carlos; Pujol Ramo, Jaume Abstract: 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. Tue, 10 Jan 2012 12:07:34 GMT http://hdl.handle.net/2117/14446 2012-01-10T12:07:34Z Martínez, Oscar; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Pizarro Bondia, Carlos; Pujol Ramo, Jaume no 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. http://hdl.handle.net/2117/13878 Title: An objective scatter index based on double-pass retinal images of a point source to classify cataracts Authors: Artal, Pablo; Benito, Antonio; Pérez, Guillermo M.; Alcón, E.; de Casas, A.; Pujol Ramo, Jaume; Marin, José M. Mon, 14 Nov 2011 15:44:00 GMT http://hdl.handle.net/2117/13878 2011-11-14T15:44:00Z Artal, Pablo; Benito, Antonio; Pérez, Guillermo M.; Alcón, E.; de Casas, A.; Pujol Ramo, Jaume; Marin, José M. no http://hdl.handle.net/2117/13727 Title: Objective optical assessment of tear-film quality dynamics in normal and mildly symptomatic dry eyes Authors: Benito, Antonio; Pérez, Guillermo M.; Mirabet, Sandra; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Marín, José M.; Artal, Pablo Abstract: PURPOSE: To evaluate and compare the tear-film dynamics in normal eyes and in eyes with mild dry-eye symptoms using a new noninvasive optical method based on a double-pass instrument. SETTING: Hospital Universitario Virgen de la Arrixaca, Murcia, Spain. DESIGN: Evaluation of diagnostic test or technology. METHODS: Dynamic recording of double-pass retinal images during unforced tear-film breakup was performed in eyes with mild dry-eye symptoms (study group) and in an asymptomatic control group. Series of consecutive retinal images were recorded every 0.5 seconds while the patient avoided blinking. Measurements were performed under low-light conditions to naturally increase pupil diameter and maximize the method’s sensitivity. Additional clinical tests were performed for comparison and included tear breakup time (TBUT), Schirmer I tests, and a normalized questionnaire (McMonnies). From the retinal images, a quality metric, the intensity distribution index, was calculated. An objective TBUT value was estimated in each eye when the intensity distribution index surpassed a defined threshold value compared with the initial baseline. RESULTS: The study group comprised 20 eyes and the control group, 18 eyes. Symptomatic dry eyes had a typical exponential increase in the intensity distribution index with time. The objective TBUT values in the study group were comparable to the clinical TBUT estimates. CONCLUSIONS: The new objective optical method to evaluate the quality and stability of the tear film was sensitive in detecting mild symptoms of dry eye and differentiating from normal cases. The procedure may allow early detection and follow-up of patients’ tear film–related complaints. Thu, 03 Nov 2011 11:23:08 GMT http://hdl.handle.net/2117/13727 2011-11-03T11:23:08Z Benito, Antonio; Pérez, Guillermo M.; Mirabet, Sandra; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Marín, José M.; Artal, Pablo no PURPOSE: To evaluate and compare the tear-film dynamics in normal eyes and in eyes with mild dry-eye symptoms using a new noninvasive optical method based on a double-pass instrument. SETTING: Hospital Universitario Virgen de la Arrixaca, Murcia, Spain. DESIGN: Evaluation of diagnostic test or technology. METHODS: Dynamic recording of double-pass retinal images during unforced tear-film breakup was performed in eyes with mild dry-eye symptoms (study group) and in an asymptomatic control group. Series of consecutive retinal images were recorded every 0.5 seconds while the patient avoided blinking. Measurements were performed under low-light conditions to naturally increase pupil diameter and maximize the method’s sensitivity. Additional clinical tests were performed for comparison and included tear breakup time (TBUT), Schirmer I tests, and a normalized questionnaire (McMonnies). From the retinal images, a quality metric, the intensity distribution index, was calculated. An objective TBUT value was estimated in each eye when the intensity distribution index surpassed a defined threshold value compared with the initial baseline. RESULTS: The study group comprised 20 eyes and the control group, 18 eyes. Symptomatic dry eyes had a typical exponential increase in the intensity distribution index with time. The objective TBUT values in the study group were comparable to the clinical TBUT estimates. CONCLUSIONS: The new objective optical method to evaluate the quality and stability of the tear film was sensitive in detecting mild symptoms of dry eye and differentiating from normal cases. The procedure may allow early detection and follow-up of patients’ tear film–related complaints. http://hdl.handle.net/2117/13667 Title: Task oriented visual satisfaction and wearing success with two different simultaneous vision multifocal soft contact lenses Authors: Gispets Parcerisas, Joan; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume; Vilaseca Ricart, Meritxell; Cardona Torradeflot, Genís Wed, 26 Oct 2011 10:11:48 GMT http://hdl.handle.net/2117/13667 2011-10-26T10:11:48Z Gispets Parcerisas, Joan; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume; Vilaseca Ricart, Meritxell; Cardona Torradeflot, Genís no Wearing success, Multifocal contact lens, Simultaneous vision, Visual demand, Visual satisfaction http://hdl.handle.net/2117/9870 Title: Revisión normativa en óptica oftálmica (I) Authors: Lupón Bas, Marta; Fransoy Bel, Marta; Martínez Roda, Juan Antonio; Caum Aregay, Jesús Wed, 20 Oct 2010 18:03:33 GMT http://hdl.handle.net/2117/9870 2010-10-20T18:03:33Z Lupón Bas, Marta; Fransoy Bel, Marta; Martínez Roda, Juan Antonio; Caum Aregay, Jesús no