The ability of our visual system to report light at threshold is confounded by intrinsic noise ('dark light') in the rod and cone photoreceptors 1,2,3,4. There are at least two types of transduction ...

Red cone photoreceptor cell arrangement: (Left) In wild-type retinas, red cones extend multiple filopodia toward neighboring cells, but these filopodia stop growing when they encounter other red cones ...