Person:
Bonnin Arias, Cristina Natalia

Profile Picture
First Name
Cristina Natalia
Last Name
Bonnin Arias
URI
https://hdl.handle.net/20.500.14352/79903
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Óptica y Optometría
Department
Optometría y Visión
Area
Optica
Identifiers
UCM identifierORCIDScopus Author IDWeb of Science ResearcherIDDialnet IDGoogle Scholar ID

Filters

20092
Reset filters

Settings

Author: Gómez Tortuero, E. × End date: 2009 ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Variation of mesopic and photopic spatial resolution in drivers older than 65 years old.
    (2009) Sánchez Ramos, Celia; Bonnin Arias, Cristina Natalia; García García, R.; Vinas Pena, M.; Chamorro Gutiérrez, E.; Gómez Tortuero, E.
    In the last century, the proportion of people over the age of 65 years has tripled (Haegerstrom-Portnoy, 1999). According to the US census 2000, persons over 65 years of age comprised 12.4% of the inhabitants of the United States (Schwager, 1999). The spanish National Institute of Statistics estimated this proportion at 16.8% of the population of Spain in 2009, representing a growth rate far higher than shown by other age groups (INE, 2009). Besides this increase, the number of elderly people who continue to drive is set to show a spectacular rise after 2010, due to the incorporation of the "baby-boom" generation and the considerably greater number of women drivers. Added to this social changes and the improved health of the elderly subject are raising the mean age of drivers (Hakkinen, 1984). Spherical and astigmatic defects worsen with age, negatively affecting visual acuity and sensitivity to contrast and glare. Ageing is also associated with diminised myopia, increased hyperopic and tendency towards inverse astigmatism (Adams, 1988). In addition, the retina often undergoes macular degeneration (Morgan, 1986). The physiological alterations of ageing also lead to changes in our sensitivity to light. Enhanced light scattering in the eye gives rise to glare, a decreased pupil diameter with the consequent reduced retinal illumination and to a general decline in visual perception (Van Den Ber, 1986). The present investigation was designed to evaluate the refractive error in vehicle drivers over the age of 65 years and to determine the possible effects of improving their habitual optical correction on visual acuity.
  • Thumbnail Image
    Item
    Lighting influence in the perception of the contrast of objects in movement by using frequency doubling technology (FDT)
    (2009) Gómez Tortuero, E.; Sánchez Ramos, Celia; Vinas Pena, M.; Bonnin Arias, Cristina Natalia; Gallego Collado, B.
    Driving is a complex task, which needs, among others, a good contrast perception of objects in movement in varying light conditions. Drivers received most of the information by means of his eyes. The area of the space perceived by the eye when a point of fixation is observed is defined as the visual field and can be affected by such factors as the design of the vehicle, the ambient conditions, the traffic, the speed of traffic and the physical and psycophysical conditions of the driver. So it must be considered the importance that a suitable visual field has for a safe driving. Light sensitivity or its inverse - the luminous differential threshold to the detection of a stimulus- changes along the field of vision. Visual fields are explored inorder to locate injuries along the optical parthway, to document its gravity and to measure its progression thoughout the time. Visual field extent depends, in a great manner, on the number and on the functioning of the receptive fields of the gangionar cells. A technology used habitually to measure it is the automated perimetry.