Person: Bonnin Arias, Cristina Natalia
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First Name
Cristina Natalia
Last Name
Bonnin Arias
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Óptica y Optometría
Department
Optometría y Visión
Area
Optica
Identifiers
4 results
Search Results
Now showing 1 - 4 of 4
Item New Optical Filter Plate for Use as Eye Protection by Welders(Welding journal, 2013) Langa Moraga, Antonio; Bonnin Arias, Cristina Natalia; Chamorro, Eva; Pérez Carrasco, María Jesús; Sánchez Ramos, CeliaPeople whose work tasks involve the use of welding torches are at special risk of suffering eye injuries due to the emission of visible, short-wavelength radiation. Current legislation requires that a company provide its employees with protection against the harmful radiation produced by welding equipment. Often, however, a worker will be reluctant to use protective goggles since these markedly cut visibility and can consequently lead to errors or even burns. This practice of avoiding the use of protection makes them susceptible to suffer irreversible severe retinal damage leading to partial or complete loss of vision. In this paper, we propose the use of a new photoprotective filter in the form of safety goggles that seeks to improve the compromised vision produced by conventional filters. We compare a series of visual function variables in 36 adults, aged 30 to 58 years, using the new optical filter and a conventional filter used for welding protection. Our findings suggest that the filter proposed provides optimal protection against the harmful effects of short-wavelength radiation while minimizing the reduced vision effects of conventional filters used for this purpose.Item Development of a Method to Potentially Substitute Direct Evaluation of Mesopic Visual Acuity in Drivers(International Journal of Environmental Research and Public Health, 2021) García Rojo, Marta María; Bonnin Arias, Cristina Natalia; Chamorro Gutiérrez, Eva; Álvarez Peregrina, Cristina; Sánchez Ramos, Celia(1) Background: In mesopic lighting conditions, or under adverse environmental circumstances, visual information is reduced, which increases the risk of traffic accidents. This effect could be reduced with a precise evaluation of the visual function under mesopic conditions, but it is difficult to replicate in clinics. This study aims to develop an easy-to-adopt method to evaluate mesopic visual acuity (VA) in drivers. (2) Methods: Prospective and observational study in drivers. logMAR mesopic VA was compared with photopic VA measured under different combinations of contrast charts and filters to find the combination that responds best to mesopic conditions. (3) Results: Fifty-six drivers were examined. The best correlation was found with an 80% density filter and a Weber contrast chart of 20%. The logMAR VA for this combination was 0.01 ± 0.11, which was close to the mesopic VA values (0.01 ± 0.12). The difference between both logMAR VA was 0.00 ± 0.06 (R = 0.86; p ≤ 0.001; ICC = 0.86). (4) Conclusions: The use of 20% contrast optotypes and the interposition of an 80% filter under photopic conditions provide VA values similar to those measured under mesopic lighting conditions, making this simple system a good predictor of mesopic VA values.Item Visual Discrimination Increase by Yellow Filters in Retinitis Pigmentosa(Optometry and Vision Science, 2016) Cedrún Sánchez, Juan Enrique; Chamorro Gutiérrez, Eva; Bonnin Arias, Cristina Natalia; Aguirre Vilacoro, Victoria; Castro, José J.; Sánchez Ramos, CeliaPURPOSE: The objective of this study was to evaluate, by halometry and under low illumination conditions, the effects of short-wavelength light absorbance filters on visual discrimination capacity in retinitis pigmentosa patients. METHODS: This was an observational, prospective, analytic, and transversal study on 109 eyes of 57 retinitis pigmentosa patients with visual acuity better than 1.25 logMAR. Visual disturbance index (VDI) was determined using the software Halo 1.0, with and without the interposition of filters which absorb (totally or partially) short-wavelength light between 380 and 500 nm. RESULTS: A statistically significant reduction in the VDI values determined using filters which absorb short-wavelength light was observed (p < 0.0001). The established VDIs in patients with VA logMAR <0.4 were 0.30 ± 0.05 (95% CI, 0.26–0.36) for the lens alone, 0.20 ± 0.04 (95% CI, 0.16–0.24) with the filter that completely absorbs wavelengths shorter than 450 nm, and 0.24 ± 0.04 (95% CI, 0.20–0.28) with the filter that partially absorbs wavelengths shorter than 450 nm, which implies a 20 to 33% visual discrimination capacity increase. In addition, a decrease of VDI in at least one eye was observed in more than 90% of patients when using a filter. CONCLUSIONS: Short-wavelength light absorbance filters increase visual discrimination capacity under low illumination conditions in retinitis pigmentosa patients. Use of such filters constitutes a suitable method to improve visual quality related to intraocular light visual disturbances under low illumination conditions in this group of patients. © 2016 American Academy of OptometryItem Sensibilidad al contraste en conducción diurna(Franja visual, 2019) Bonnin Arias, Cristina Natalia; Gutiérrez Jorrín, Sara; Rodríguez Alonso, Xabier; Sánchez Ramos, CeliaLa conducción de vehículos es una tarea que requiere un alto nivel de concentración y adecuado estado de la estructura y de la función visual. Se considera conducción diurna cuando los niveles de iluminación son superiores a 10 candelas por metro cuadrado dentro del habitáculo del vehículo. Normalmente se analiza y se evalúa para obtener los permisos para conducir la agudeza visual como capacidad de resolución espacial; sin embargo, conocer el estado de la percepción del contraste es fundamental para una correcta visión de la escena a cualquier velocidad, teniendo en cuenta la movilidad de los objetos en el exterior. Por tanto, en este artículo, se va a introducir el concepto de contraste, la importancia de la relación entre la luminancia del objeto y el fondo, para valorar debidamente el estado de la visión de los conductores.