Person:
Pérez Carrasco, María Jesús

First Name

María Jesús

Last Name

Pérez Carrasco

URI

https://hdl.handle.net/20.500.14352/79893

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Óptica y Optometría

Department

Optometría y Visión

Area

Optica

Identifiers

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Search Results

Now showing 1 - 10 of 29

Effect of a yellow filter on mesopic pupil size.
(2004) Sánchez Ramos, Celia; Puell Marín, María Cinta; Langa Moraga, Antonio; Pérez Carrasco, María Jesús; Jiménez, I.; Pelaez, T.
PURPOSE: It has been recently reported that pupil size is independent of the wavelength for adapting luminances from photopic to mesopic. Herein, we tried to determine whether blue-blocking filters really increase pupil size, as has been reported previously, in an effort to establish if this type of lens has any effect on vision at night when blue takes on much greater importance. METHODS: Mesopic pupil size was measured in 62 eyes of 31 healthy subjects (mean age 37 +- 13 years) using the digital (Procyon 2000) infrared pupillometer for binocular simultaneous measurements of pupil diameter. Measurements were performed at a low mesopic illuminance level (0.40luz) after 5 min of dark adaptation and while the observer viewed through a yellow coated filter (X-482nm cut-off), through a neutral density (ND) filter, or no filter. RESULTS: For righ eyes, mean mesopic pupil diameter was 6.05+-1.41mm (range 3.05-8.17mm) with the yello filter, 5.97+-1.37mm (range 3.01-8.15mm) with the ND filter, and 5.87+-1.30mm (range 3.02-8.28mm) without a filter. No significant differences were shown between the pupil sizes of both eyes. No pupil size differences were detected whether a filter was used or not, nor when the population was divided into three age groups. CONLCUSIONS: The yellow filter has no effect on pupil size under mesopic luminance conditions. Accordingly, its use would not compromise visual quality at night.
Influencia del hábito de conducción en la sensibilidad al contraste mesópica sin y con deslumbramiento.
(2004) Elena Tirado, María José; Puell Marín, María Cinta; Langa Moraga, Antonio; Pérez Carrasco, María Jesús; Sánchez Ramos, Celia; Martínez de Miguel, María Angeles; Agustín Gonzálo, Monica; Vicente González, Eva
La sensibilidad al contraste (SC) se relaciona en algunos estudios con la capacidad de conducción, además dicha capacidad se puede ver reducida en condiciones de baja iluminación. Nuestros objetivos fueron valorar la SC mesópica- sin y con deslumbramiento- en conductores de vehículos de mediana edad y analizar el efecto del hábito de conducción.
Agudeza visual Snellen versus agudeza visual medida por interferencia.
(1996) Langa Moraga, Antonio; Sánchez Ramos, Celia; Puell Marín, María Cinta; Pérez Carrasco, María Jesús
Los test de interferencias para la agudeza visual permiten la función macular con independencia del estado del sistema óptico ocular, siendo de gran inte´res por ser un método objetivo, además de ser útil cuando los medios oculares presentan opacidades. Nuestro objetivo es investigar en población joven universitaria la relación existente entre los valores de agudeza visual obtenidos con la E de Snellen y los obtenidos con el IRAS GT 761, con objeto hacer una valoración de este nuevo método de medida y evaluar la posible pérdida de agudeza visual debida al sistema óptico.
Nuevo instrumento para medir la sensibilidad al contraste sin y con deslumbramiento
(Archivos de la Sociedad Española de Oftalmología, 2003) Sánchez Ramos, Celia; Puell Marín, María Cinta; Pérez Carrasco, María Jesús; Langa Moraga, Antonio; Benítez Del Castillo Sánchez, José Manuel
OBJETIVO/MÉTODO: valorar la sensibilidad al contraste fotópica, sin y con deslumbramiento con un nuevo instrumento. Se estudiaron 78 ojos derechos de 49 adultos jóvenes y de 29 adultos entre 35 y 55 años. La sensibilidad al contraste se midió con el Contrast Glarester CGT-1000 mediante una estrategia automatizada de reconocimiento para seis frecuencias espaciales. RESULTADOS/CONCLUSIONES: Los valores de sensibilidad al contraste fueron semejantes a los obtenidos con otros test clínicos. El aumento de la edad disminuyó significativamente la sensibilidad al contraste sin y con deslumbramiento. Sin embargo, el deslumbramiento no modificó la sensibilidad al contraste fotópica.
Effects of age and the retinal zone stimulated on differential luminance sensitivity in vehicle drivers over 65 years.
(2004) Vila, J.; Moral Martinez, M.I.; Sánchez Ramos, Celia; Puell Marín, María Cinta; Pérez Carrasco, María Jesús; Pérez Pérez, J.M.
PURPOSE: To evaluate central visual field (30º) differential luminance sensitivity (DLS) in drivers over the age of 65 years and compare responses according to the zone of the retina stimulated and age. METHODS: DLS was determined under photopic conditions (85 cd/m2) in 62 subjects (right eye) using a Humphrey model HFA-II 730 campimeter (Zeiss) to perform the STACTPAC technique with Goldamnnis stimulus III. Test were conducted with habitual correction for near vision. RESULTS: The mean age of our population sample was 72.5 +- 5.4 year (85% men/15% women). Mean visual acuity was 0.82+-0.14. The mean spherical power of the lenses was +0.93 +- 1.87D and cylindrical power -0.87+-1.63D. Mean added power was 2.42+-0.59D. Mean DLS was 27.01+-2.52dB. Values by retinal zone were 30.32 +-2.35 dB (foveal) 28.77 +-2.50dB (parafoveal), and 26.14 +-2.76 dB (peripheral). When the simple was stratified by age (older or younger than 70 years), significant differences in DLS were obteined for the four quadrants and the different retinal zones. CONCLUSION: Mean DLS values for the drivers differed significantly among the foveal, parafoveal and peripheral zones of the retina, with measurements made at the fovea being significantly higher. In drivers above 65 years, age showed a negative effect on DLS in all the retinal zones examined.
Características funcionales y ergonómicas de las lentes ocupacionales.
(2005) Sánchez Ramos, Celia; Moral Martínez, M.I.; Alonso Fernández, José; Puell Marín, María Cinta; Langa Moraga, Antonio; Pérez Carrasco, María Jesús
El propósito de este trabajo ha sido evaluar tanto objetiva como subjetivamente las características ergonómicas y funcionales de las lentes ocupacionales, comparándolas con las lentes monofocales convencionales. Esta evaluación se ha realizado con pruebas psicofísicas como sensibilidad al contraste, agudeza visual de contraste variable, y perimetría FDT, además de con un cuestionario subjetivo. La muestra ha estado compuesta por 30 pacientes con edades comprendidas entre 40 y 58 años. Las conclusiones indican que tanto objetiva como subjetivamente se obtienen diferencias por el uso de las lentes ocupacionales.
Contrast sensitivity and disability glare in patients with dry eye
(Acta Ophthalmologica Scandinavica, 2006) Puell Marín, María Cinta; Benítez Del Castillo Sánchez, José Manuel; Martínez De La Casa Fernández-Borrella, José María; Sánchez Ramos, Celia; Aladro Vico, Eva; Pérez Carrasco, María Jesús; Pedraza Aranda, Constanza; Hierro Zarzuelo, Almudena, del
Purpose: To evaluate contrast sensitivity and disability glare in patients with dry eye using the Contrast Glaretester 1000. Methods: Contrast sensitivity and disability glare were determined in 33 eyes of 33 patients with dry eye and 30 eyes of 30 healthy control subjects for six target sizes with a visual angle of 6.3-0.7 degrees using the Contrast Glaretester 1000, whose working mechanism is similar to that of the conventional perimetry instrument. Results: Contrast sensitivity was significantly worse in dry eye group when viewing all target sizes (reduction of 0.10-0.25 log contrast units, p < 0.01) except at 6.3 degrees. In the presence of glare, differences in log contrast sensitivity between the groups (0.10-0.25 units) were significant (p < 0.01) for all target sizes, with the dry eye group showing worse results. The reduction in contrast sensitivity induced by glare (disability glare) was significantly worse in the dry eye group versus the control group but only for the 2.5-degree size target, where 0.14 log contrast units were lost. Conclusions: Contrast sensitivity with and without glare was significantly reduced in patients with dry eye compared with control subjects, but the number of log contrast units lost with glare (disability glare) was similar in the two groups, except for the 2.5-degree size target.
Effect of the discrimination of movement objects on the contrast sensitivity for frequency doubling technology.
(2002) Pérez Carrasco, María Jesús; Sánchez Ramos, Celia; Puell Marín, María Cinta; Langa Moraga, Antonio
Influence of refractive state on mesopic/scotopic pupil diameter and anisocoria.
(2005) Sánchez Ramos, Celia; Moral Martínez, M.I.; Ortiz Calcerrada, P.; Puell Marín, María Cinta; Pérez Carrasco, María Jesús; Langa Moraga, Antonio
PURPOSE: To stablish the effect of the refractive state of a subject on pupil diameter and anisocoria in mesopic and scotopic conditions. METHODS: A prospective evaluation was performed of the pupil size and refractive state of 68 subjects aged 16 to 56 years ( 24.27 +-6.2 years) free of any eye pathology. Measurements were obtained using the ifrared, binocular pupillometer P2000 (Procyon Instruments Ltd) after a 5 min period of adaptation to mesopic condition ( 3cd/m2). Determinations were made at three luminance levels: 0.04 lux (scotopic), 0.4 lux ( low mesopic) and 4 lux (high mesopic). For each measurement, 10 photographs of both pupils were automatically taken. Refractive error were determined using the Nidek mod.700 autorefractometer. Subjects were classified according to their refractive state as: emmetropes (+0.50D to -0.50D), myopes (from -0.75D) and hypermetropes (from +0.75D)
Contrast sensitivity during night driving in subjects over 50 years.
(2004) Gonzalo, Agustín; Sánchez Ramos, Celia; Pérez Carrasco, María Jesús; Puell Marín, María Cinta; Langa Moraga, Antonio; Tirado, Elena; Martínez, M.A.
PURPOSE: To evaluate contrast sensitivity (CS) in mesopic conditions in the presence and absence of glare in vehicle drivers over the age of 50 years. METHODS: Mesopic CS (3cd/m2) was determined in 120 subjects (right eye) using the OPTEC 3600 device and the FACT test. This involved evaluating the contrast threshold for the spatial frequencies 1.5,3,6,12 and 18 cycles/º. All test were performed with habitual correction for long distance. Contrast sensitivity measurements with and without glare were made after a 5 min period of dark adaptation. RESULTS: Maximum mesopic CT values with and without glare were obteined for the spatial frequencies 6 and 12 cycles/º mesopic CS decreasing for higher or lower frequencies. Mesopic CS also dismished with age (p<0.03). Hiher mesopic CS values were recorded for heavy vehicle drivers than motorcar drivers (p<0.05) and for subjects driving more than 5 days per week (p<0.05). CONCLUSION: The mesopic CS function shows a band pass pattern similar to that shown by the photopic CT function. The higher mesopic CS in heavy vehicle drivers could reflect the visual requirements upheld by Spanish legislation. The fact that subjects with less mesopic CS drive less than 5 days/weeks suggests they are more reluctant to drive since they feel more insecure. The OPTEC 3500 instrument does not have an effective source of glare that is capable of producing disability glare.