| Mesopic Vision | ||
| Vision in the photopic region (adaptation luminance >10 cd/m˛ [this is daylight vision]) is carried by the cone receptors of the retina. Their sensitivity is defined by the spectral sensitivity curve t Vl (lmax = 555 nm). |
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| At scotopic light levels (this is night time vision at adaptation luminances < 0.01 cd/m˛ ) other kinds of receptors, the rods, are active. Their spectral sensitivity at this low luminance levels is represented by the Vl' (lmax = 507 nm) function. Compared to the sensitivity of cone receptors, the maximum of this function is shifted to shorter wavelength (lmax = 507nm). |
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| In traffic situations at night time luminance levels range between 0.01 – 10 cd/m˛. This transition luminance range is called “mesopic”. For mesopic vision a standardised validation of light has not carried out up to now. | ||
| The project group “Mesopic Vision” deals with the performance of the human visual system under mesopic light condition. The research concentrates on two projects: Firstly on the development of a system of mesopic photometry based on locally resolved luminance measurements for the optimization of active lighting systems, and secondliy on the development of a model to predict and evaluate the recognition distance of automotive headlamps. | ||
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