Article: https://www.pnas.org/content/115/50/E11817

Awful headline. This isn't about "how does my dog see the world", but about an energy-preservation mechanism in the retina.

They found that when it's dark out, the neurons in the optical nerve fire less frequently, effectively reducing the bandwidth of information because most of it is noise anyway, and that this regulation is based on the signal of ambient light receptors [0] (which make up only about 1%, compared to rods and cones), which the authors chemically stimulated to confirm the hypothesis.

[0] https://en.wikipedia.org/wiki/Intrinsically_photosensitive_r...