INVESTIGADORES
MARTIN Andres
congresos y reuniones científicas
Título:
Modeling the interaction between blur and automobile tinting films on vision
Autor/es:
MARTÍN, A.; BARRIONUEVO, PABLO A.; SANTILLAN, JAVIER E.; LANSINGH, V.; NANO, M. E.
Lugar:
Florida, USA
Reunión:
Congreso; ARVO 2010; 2010
Resumen:
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Introduction:
In many countries it has became popular to darken the side and rear
car windows by tinted films. It is done despite that, generally,
countries laws ban drivers from getting dark the windows bellow a 70%
transmittance. Possibly it is the lack of a precise knowledge linking
the effect of window tinting to drivers vision what enables its
widespread use. In order to contribute with some evidence about this
relevant link, we present here a series of measurements in which
Contrast Sensitivity Function (CSF) was used to characterize the
human visual system. Since it is also known that many people have
undetected refractive problems, we measured the combined effect of
tint and blur on vision. In order to predict the visual systems
behavior under different blur conditions, we fitted the Bartens
model (Barten, 2003) to the data.
Methods:
CSF was measured on 10 young observers with normal vision (VA 20/20
or above) under 3 windows tint conditions and 4 different blur
degrees. The tint conditions were: None (control), Middle and Dark
(82%, 42% and 7% transmittance respectively) and the blur were
equivalent to +0.5, +1, +1.5, and +2 diopters. The CSF was set at 1,
2, 4, 8 and 12 cycles per degree of visual angle. We also measured 5
young myopic observers. (Colombo, Issolio, Santillan, &
Aguirre, 2009)
Conclusions:
without blur, a car window with 7% transmittance significantly
reduces the CSF at the spatial frequencies of 4, 8 and 12 c/deg while
the Middle tinted window didnt distinguish from control. For blur
cases above +0.5 diopters, the results showed a significant CS
reduction at higher spatial frequencies for all tinted conditions.
The results also showed that the combined effect of tint and blur
makes the CS to decay quickly. Model fits explains, on average, more
than 90% of data. The myopic data also were well fitted by the model.
A potential application of this research is to advice on futures
regulations about tinting films for automobile windows.