Person:
Sánchez Ramos, Celia

First Name

Celia

Last Name

Sánchez Ramos

URI

https://hdl.handle.net/20.500.14352/79912

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 - 8 of 8

DEVICE AND METHOD FOR THE DETECTION AND QUANTIFICATION OF VARIATION IN EYE DAMAGE CAUSED BY BLUE AND VIOLET LIGHT IN THE VISIBLE SPECTRUM
(2019) García Manchado Nilo; Sánchez Ramos, Celia; "Universidad Complutense de Madrid", "CRAMBO S.A."
Método, dispositivo (100) y sistema (200) para la detección y cuantificación de la variación del daño ocular provocado por la luz azul y violeta del espectro visible que comprende las etapas de detectar la radiación incidente sobre el sistema visual de un individuo; calcular la radiación incidente dentro del rango comprendido entre 380 y 500 nm; establecer al menos un umbral de radiaciones incidentes dentro de dicho rango; detectar si se ha superado al menos un umbral establecido para dicho rango; avisar de la superación de al menos un umbral; medir el tiempo de exposición a la radiación incidente; e inferir en las distintas estructuras oculares de un individuo el efecto de las radiaciones incidentes y avisar de dicho efecto.
Effect of a yellow filter on mesopic contrast perception and differential light sensitivity in the visual field.
(Ophthalmic Research, 2003) Pérez Carrasco, María Jesús; Puell Marín, María Cinta; Sánchez Ramos, Celia; Langa Moraga, Antonio
Purpose: Previous studies on the effects of yellow filters in the visual performance have been carried out, presenting discrepancies among the different investigations. Our study reports the influence of the yellow filter without residual reflections on contrast perception and differential light sensitivity (DLS) under mesopic conditions. Methods: Contrast sensitivity, low contrast visual acuity and luminance thresholds in the central visual field (30 degrees ) were measured in a group of 38 adult subjects with and without a coated yellow lens (482-nm cut-off) under mesopic conditions. Results: The contrast sensitivity mean was significantly better with the filter at low- and middle-range spatial frequencies (1.5 cycles/degree p = 0.002 and 6 cycles/degree p = 0.02). At 5% contrast, the mesopic low contrast visual acuity improved significantly (p = 0.004) when interposing the yellow filter. The increase in DLS was statistically significant [e.g. all visual fields p = 0.0003 and macular visual field (9.5 degrees ) p = 0.00001] through the yellow filter on the different established areas of the visual field (30 degrees ). Conclusions: The yellow filter without residual reflections had a positive influence on the brightness and contrast perception of healthy subjects, for which its use would be beneficial under mesopic conditions.
Normal values of distance heterophoria and fusional vergence ranges and effects of age.
(Graefe´s Archive for Clinical and Experimental Ophthalmology, 2005) Palomo Álvarez, Catalina; Puell Marín, María Cinta; Sánchez Ramos, Celia; Villena Cepeda, Consuelo
Background: Although it is well known that age affects visual function, we still have much to learn about the impact of aging on binocular vision. Our aim was to establish distance heterophoria and distance fusional vergence ranges in a large non-clinical population of wide age range, to provide normal values for comparisons. Methods: A cross-sectional study was performed on 271 non-clinical subjects stratified into six age groups. Distance heterophoria measurements were obtained using the von Graefe technique and distance horizontal fusional vergence ranges using Risley rotary prisms in each subject, with best spectacle correction. Results: The mean heterophoria value for distance fixation was exophoric except for the 71-80 year age group, which was esophoric. No effects of age were observed on distance heterophoria and distance base-in and base-out break means. However, a significant effect of age was noted on base-in recovery and base-out recovery. Between the youngest and oldest age groups, mean base-in recovery decreased by 2.5 Delta and mean base-out recovery by 3.3 Delta. Conclusions: Distance base-in and base-out recovery means diminished significantly with age such that recovery values fell outside the norm in subjects in the 61-70 year age group and older. This study establishes statistical normal values for distance heterophoria and fusional vergence in a non-clinical population. Mean values such as these are valuable tools for identifying subjects with far binocular anomalies.
Mesopic contrast sensitivity in the presence or absence of glare in a large driver population.
(Graefe's Archive for Clinical and Experimental Ophthalmology, 2004) Puell Marín, María Cinta; Palomo Álvarez, Catalina; Sánchez Ramos, Celia; Villena Cepeda, Consuelo
Background: To evaluate mesopic contrast sensitivity in conditions of glare and no glare in a vehicle driver population, and to explore the effects of age, habitual spectacle correction, photopic visual acuity and driving exposure. Methods: A cross-sectional study was performed on 297 drivers stratified by age into six groups. The mesopic contrast sensitivity was measured in the absence or presence of glare using the Mesotest II (Oculus, Germany) in each subject both with habitual and best spectacle correction. A questionnaire on the subject's driving habits was completed. Results: There were no significant differences between contrast sensitivity measured with habitual or best spectacle correction. In conditions of no glare, the mesopic contrast sensitivity gradually got worse from 51 to 60 years onwards, and from 41 to 50 years onwards in the presence of glare. In both conditions, the total decrease in contrast sensitivity was 0.3 log units. The with-glare and without-glare mesopic contrast sensitivity improved as photopic visual acuity increased. Forty-five per cent of drivers who reported difficulties in driving at night were unable to perform any of the tests with glare, compared to 20% without glare. However, the effect of driving habits on contrast sensitivity was only significant in the oldest age group. Conclusions: The mesopic contrast sensitivity and glare sensitivity seem to be stable until the age of 50 years, from which point they start to decline at a rate of 0.1 log contrast sensitivity loss per decade. Drivers with poor visual acuity and/or older drivers who avoided night driving presented worse mesopic contrast sensitivity and greater glare sensitivity.
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.
Lentes que controlan la luz.
(Franja visual, 2020) Bonnin Arias, Cristina Natalia; Sánchez Ramos, Celia; Rodríguez Alonso, Xabier; Gutiérrez Jorrín, Sara
Este artículo se propone conocer la cantidad de luz para todo el espectro visible que alcanza los ojos de las personas en un día nublado y en un día soleado; en función de la posición de mirada del individuo. Se ha querido realizar un ejercicio experimental en esta primera parte, para conocer cuánta luz en fotones llega hasta los ojos de los peatones. Para ello y en todas las medidas se ha utilizado el espectrofotómetro OceanOptics USB2000+ junto con el software SpectraSuite. Este dispositivo realiza mediciones en cuantas de luz (fotones) del rango del espectro comprendido entre 200 y 1100 nm. Como receptor se empleó una fibra óptica muy sensible.
Protección del sol en la montaña: Los ojos son más vulnerables.
(Franja visual, 2020) Bonnin Arias, Cristina Natalia; Gutiérrez Jorrín, Sara; Rodríguez Alonso, Xabier; Domínguez Valdés, Teresa; Sánchez Ramos, Celia
El uso de lentes para protección solar está extendido a casi todos los ámbitos de la vida diaria en exterior; sin embargo, determinadas activi dades y condiciones requieren una especial atención al seleccionar los lentes más adecuados. Éste es el caso de los deportes y actividades de montaña (senderismo, alpinismo, escalada y otros).
Protección ocular en deportes acuáticos.
(Franja visual, 2019) Bonnin Arias, Cristina Natalia; Sánchez Ramos, Celia; Rodríguez Alonso, Xabier; Gutiérrez Jorrín, Sara.
Como de todos es sabido, existen dos tipos de deportes acuáticos, aquellos que se realizan fuera del agua, también llamados deportes náuticos, como el surf, la vela o el piragüismo; y los que se realizan dentro del agua, como la natación, el waterpolo o la natación en aguas abiertas, y por tanto también existen diversas opciones para la protección ocular.