On PoC I have some carefully prepared and useful images which shows us, in my opinion, how cats see the world compared to humans. You might find that page interesting – Cat Vision Pictorial Examples. On this page, I am comparing the eyesight of dogs and parrots. Why not? Of course, I’m also comparing their eyesight with that of humans.
On this occasion, I did not prepare these images. They had been prepared by Home Adviser and are presented on the Daily Mail website. I can’t vouch for their accuracy. I believe that my cat-eye points of view were better prepared I have to say 😊. I am sure that there is some guesswork involved because we never know exactly what an animal is thinking or seeing. Nonetheless, I think that you will find these images quite interesting.
In the two images below, you see their depictions of how firstly dogs and secondly parrots see the same room.
Dogs, they say, have only 20-40% of the visual acuity of humans. In contrast, dogs have a much better sense of smell and rely upon it. Dogs do, however, have a 240° field-of-vision. This gives them a much wider angle in which to view the world.
It is said that dogs see colour like a colourblind human. The retina of dogs can distinguish two colours: blue-violet and yellow. And dogs can also differentiate between shades of grey according to my research. They cannot recognise red, orange, yellow and green.
They say that parrots are able to adjust their focus with great rapidity and have a 300° coverage. They also have monocular vision. This allows one eye to focus while the other eye wanders. Apparently, parrots can see in blues, greens and reds and also ultraviolet.
Interestingly, guide dogs for blind people may not be able to distinguish between the traffic light colours but they look at the brightness and position of the light instead. To that they add observations about the flow and non-flow of traffic to tell them when it is time to cross the street.
The fact that a dog’s eyes are usually set at a 20° angle rather than straight forward increased their field of view and accordingly their peripheral vision. Better peripheral vision compromises binocular vision. Binocular vision provides for better depth perception.
Dogs can obtain good depth perception when they look ahead but their nose can interfere. Binocular vision is important because depth perception is important in catching, jumping and leaping accurately. These skills are important for a predator.