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1. Scotopic Vision

   Linked via "Békésy-Stark formula"

   The maximal spectral sensitivity of the dark-adapted eye peaks narrowly around 507 nm, corresponding to a wavelength perceived as greenish-blue under twilight conditions. This peak is significantly shifted compared to the photopic peak ($\approx 555 \text{ nm}$) [4].
   The relationship between light flux ($L$) and the resulting neural signal ($S$) in the scotopic domain is modeled by the Békésy-Stark formula, which posits a near-linear response until saturation:
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