Meritxell Vilaseca

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PURPOSE The present study aimed at investigating the influence of the level of dynamism of two different visual display terminal tasks on spontaneous eyeblink rate, blink amplitude, and tear film integrity. MATERIAL AND METHODS A total of 25 healthy, young volunteers participated in the study. Blink rate and blink amplitude were recorded in silent primary(More)
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(More)
An algorithm is proposed for the spectral and colorimetric characterization of digital still cameras (DSC) which allows them to be used as tele-colorimeters with CIE–XYZ color output, in cd/m 2. The spectral characterization consists in the calculation of the color-matching functions from the previously measured spectral sensitivities. The colorimetric(More)
In this paper, we analyze a color visualization system for multispectral images belonging to the near-infrared region (NIR, 800-1000 nm). Samples with the same appearance in the visible region can differ in the NIR and can be differentiated by taking into account the extra information included in this region. Using a multispectral system, five different(More)
From real spectroradiometric data, we propose an algorithm to obtain camera opto-electronic conversion functions (camera OECFs) for different values of the lens aperture N from the opto-electronic conversion spectral functions (OECSFs). Working in the linear range of the inverse OECFs, we have found that the slope vs. lens aperture function is fitted by a(More)
PURPOSE To evaluate the intra- and intersession repeatability of the optical quality parameters provided by the Optical Quality Analysis System (OQAS), which is based on the double-pass technique. METHODS We performed optical quality measurements using the OQAS on 20 eyes of 10 healthy subjects who had best spectacle-corrected visual acuity of 20/20 or(More)
The CIE system, which was formulated in the 1930s based upon the work of David Wright and John Guild, became the foundation of modern colorimetry, the science underlying modern, instrument-based, industrial color production. Colorimetry soon led to the British developing National Standards for divers applications from electrical wiring to traffic lights. In(More)
Digital image capture devices cannot be used directly as instruments for color measurement. The main stages for characterizing a digital image capture device as an instrument for color measurement are the spectral and spatial characterization and the color transformation from the RGB device dependent space to a device independent space such as CIE-XYZ. We(More)
BACKGROUND/PURPOSE In this work, we present a new and fast easy-to-use device that allows the measurement of color and the detection of spots on the human skin. The developed device is highly practical for relatively untrained operators and uses inexpensive consumer equipment, such as a CCD color camera, a light source composed of LEDs and a laptop. The(More)