Seeing with the Eyes of Mice. Mice are not the first animals that come to mind when thinking of colour vision. Mice are certainly no colour specialists but like most mammals, mice feature two spectral types of cone opsins, a medium (M, "green") and a short (S, "UV/blue") wavelength sensitive opsin. Mice are, thus, dichromates - as confirmed by behavioural experiments. In addition, the mouse retina displays an odd specialization that one would expect to hamper colour vision at least in the ventral retina: a dorso-ventral gradient of cone opsin co-expression that renders ventral M-cones UV/blue-sensitive. In my talk, I will review the chromatic circuits in the mouse retina and discuss what functional role the opsin gradient might have in mouse vision.