Sight in dogs - black and white or color
A lot of controversy has long been conducted on the topic: Do dogs distinguish colors. What sight in dogs? It has long been believed that our faithful friends see the world in black and white, but recent studies in the US prove that dogs see colors.</ P>
But not like a man. This is due to the structure of their eyes. The cones, which in the retina of the eye are responsible for the perception of color, are smaller in dogs than in humans. In addition, they generally lack cones that are sensitive to long-wave radiation - orange and red. Therefore, dogs do not distinguish between orange-red and yellow-green colors. Practically, as color-blind. And what we see as blue-green, the dog seems white.
But our pets distinguish shades of grayMuch better than a person. In the retina of their eyes, there are more photosensitive cells (rods) that are responsible for vision at dusk. And the wands themselves in dogs are much more sensitive. Therefore, in the dark they see three to four times better than a person. However, visual acuity in these animals is about three times lower than human. In fact, they have a weak farsightedness (no more than +0.5 diopters).
Although this roughly corresponds to the indicatorsVisual acuity of most adults. But the visual acuity is not so important to the predator. Much more important is the ability to see equally well both day and night. Also, dogs see the moving object much better, in contrast to the stationary one. Moving object they are able to distinguish at a distance of 800-900 meters. But if it is frozen, it will be discernible for a predator only from 600 meters. It is with this connected advice - not to run away from the dog. She immediately turns on the instinct of the hunter, and she perceives man as a prey.
In addition, the dog rather accurately determinesDistance. And at close range, it's worse "hinted at." So a person can focus the sight on an object just a few centimeters from the eyes. A dog that is closer than 35-50 cm, sees a vague. And they do not recognize themselves in the mirror. And the field of vision of a dog is not the same as that of a human. We see the world in the form of a circle, and the dogs in the shape of an ellipse. And their field of view is wider - 240-250 degrees, which is 60-70 degrees more than human.
However, different breeds have their own nuances thatDepend on the location of the eyes, the structure of the skull and even the shape of the nose. Thus, dogs with a short nose and broad muzzles (for example, pug, Pekingese, English Bulldog) have more limited lateral vision unlike narrow-horned hunting breeds. And one more interesting fact. Everyone knows that dogs do not watch TV and this is due to the frame rate perceived by their eyes. Many TVs broadcast a frequency of 50-60 hertz, and in dogs it is higher - about 80 hertz. Therefore, instead of a movie, the dog sees flashing pictures. Although the new generation TVs already have a frequency of 100 hertz. In this apparatus and the dog, there is something to see.