This paper deals with the modelling of the mesopic detection sensitivity data described in Part 1. The modelling is based on a linear combination of the spectral sensitivity templates of four retinal mechanisms (long + medium wavelength sensitive cones, rods, short wavelength sensitive cones and long - medium wavelength sensitive cones opponency) to describe the experimental data on mesopic detection sensitivity and to provide a practically usable model. Model parameters representing the weighting of these mechanisms are analysed as a function of target eccentricity and background luminance.
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