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From a recent paper, Direct detection of a single photon by humans. JN Tinsley et al. Nature Comms 7, 12172 (2016) (open access). Abstract: [...] Here we report that humans can detect a single-photon incident on the cornea with a probability significantly above chance. This was achieved by implementing a combination of a psychophysics procedure ...


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See the CIE 1931 color space, it is based on the sensitivity of the cones. You can find standards and tabels on the site of The Colour & Vision Research laboratory and database. The functions can be downloaded in cvs, xml, tabular or plot format, with stepsize of 0.1 nm, 1 nm or 5 nm. No mathematical formula, but a lookup or a formula doesn't make much ...



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