The luminance conditions during driving variation affects to the drivers visual system, which is able to adapt itself to these different luminances by varying its pupil size. This pupil size variation can be induced in an artificial non-invasive way by using different optical filters. This study shows the importance of the optical filter properties on pupil size variation when it's measured at mesopic lighting condition. Material and Spectral characteristics of the filter are the main properties that should be evaluated. First of all, the spectral characteristics of the filter have been evaluated. Only low transmittance filters have induced significant variations on pupil size (p=0.00). Moreover, when these low transmittance filters spectral characteristics have been evaluated, differences in the blue-light band transmission are obvious. Also differencies between both materials (PET and CR39) are clear. Greater results in midriasis-induced-by-the-filter have been obtained with CR39 lenses, with lower amount of blue-light transmitted. This confirm the fact that the spectral sensitivity of the pupillary mechanism is greater in the blue part of the visible spectrum, this means that blue light gives rise to smaller pupils compared to those that occur with light of other colors of the same luminance. That's the reason to study the pupil response to different blue-light transmission filters. In conclusion, our findings indicate that it is possible to obtain optimal results when trying to manipulate mesopic pupil diameter using an optical filter. Although, it is essential that a balance is obtained between the percentage of visible light transmitted by the filter used and the quality of this light. Finally, it is possible to improve drivers visual perception in night driving with an artificial non-invasive way, by using specific optical filters, in order to get a greater pupil size in this case. This is very important in dim driving conditions, in which the amount of light reaching the retina determines specially the quality of vision.
Optical filter quality effect on pupil size in night driving
2009
9 Seiten, 2 Bilder, 2 Tabellen, 27 Quellen
Aufsatz (Konferenz)
Englisch
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