Since these cells respond mostly to blue light, it has been suggested that they have a role in mesopic vision and that the old theory of a purely duplex retina with rod ( dark ) and cone ( light ) light vision was simplistic.
12.
The energy-savings potential of using a new way to measure mesopic lighting scenarios is significant; superior performance could in certain cases be achieved with as much as 30 to 50 % reduction in the energy use comparing to the high pressure sodium lights.
13.
The Purkinje effect occurs at the transition between primary use of the scotopic ( rod-based ) systems, that is, in the mesopic state : as intensity dims, the rods take over, and before color disappears completely, it shifts towards the rods'top sensitivity.
14.
The human eye uses scotopic vision under low-light conditions ( luminance level 10 " 6 to 10 " 3.5 cd / m?), and mesopic vision in intermediate conditions ( luminance level 10 " 3 to 10 0.5 cd / m?).
