The following locations will service your tonometer. In Dogs, Horses, and Cats 1. The horse has a total field of vision of near 350 . 2. Large frontal binocular visual field of 85 in dogs and cats, and 65 in horses. Dogs have cones that are receptive at 429 and 555 nm and are dichromats.
Cats are weak trichromats.
They live in a world of fuzzy pastels Dogs and cats appear to respond to the blue and yellow short-wave length colors the best, but appear to have trouble with green and red. Both are also rod-dominant animals. As rods do not function in daylight these animals are dependent on their few cones for spatial and temporal visual resolution, which probably means that their blue and yellow visual world is a fuzzy blue and yellow world. What appears red to us is simply dark to the dog and cat, and a part of the green spectrum is indistinguishable from white. Colors that would appear very rich to us are more pastel-like to the cat.