Can dogs see things at night? We all probably know that dogs don't have a high resolution for colors. The colors they see are different from ours. The light at night is not enough. We will worry about whether dogs can see things at night. Dogs can see things at night, but they are not as clear as during the day. Here are veterinarians Experts on some of the dog's vision related information, you can learn about it.
For the dog's eyesight, please do not care, after all, different kinds of organs are not the same, they see things are not so colorful, but the same very happy, this is good.
The difference of human and dog vision lies in the response to light, the dog eye is different from the human eye. The human eye responds to the three primary colors (blue, yellow, and red) that cause various colors. The vision of a dog is different from that of a man; a dog can't distinguish colors like a man, but a dog can see some colors. Dogs can distinguish blue, indigo and purple in different depths, but they have no special sensitivity to high color colors such as red and green in the spectrum. Red is dark to dogs, green is white to dogs, so green lawn is white to dogs.
The retina of a dog the retina, the light receptor in a dog's eye, contains a large number of rod-shaped cells that help to see in the dark and detect moving objects. Another type of cell in the retina is the optic vertebrate cell. The function of the vertebrate cell is to distinguish the color and the tiny place. There is an extra layer of tapetum lucidum on the retina, which is strongly reflective and can also increase the dog's night vision. Because the light enters the eye, it will hit the photoreceptor on the retina, but it may also miss and pass through the retina; however, for dogs, due to the choroid layer, even if the light does not hit the light receptor, it will still reflect back to the retina, resulting in the so-called second vision. The choroid layer of the dog is also the reason why the dog's eyes appear yellow, green, red and so on in strong light. There are a few dogs whose eyes lack this structure, but the reason is still unknown.
Every day with the dog's company, we have more colors, but the dog's eyes can not see more color world, this is puzzling.
Of course, if you categorically say that dogs are color blind, this statement is somewhat inaccurate. But "color blindness" means "together with human beings". Dogs can only see part of the visible spectrum, so yes, dogs are color blind. Scientists can determine this in two ways. But first of all, let's take a look at what the world looks like in the eyes of dogs.
There are two kinds of cone cells in the retina of dogs. They can recognize short wavelength and medium long wavelength light waves, that is, they can sense blue light (short wavelength light wave) and red yellow light (medium and long wavelength light wave). Due to the lack of cone cells, the color in the dog's eyes is very monotonous, not as colorful as the world in human eyes.
Humans, however, have three types of cones that allow us to see light of all colors in the visible spectrum. Because dogs have only two types of cones, they can distinguish the same colors as red and green color blind patients can. But there are many other colors that people with color blindness can see, so do dogs? Scientists have two ways to determine.
One way is to irradiate a dog's eye with a beam of colored light, which is reflected back from the dog's eye. Scientists study the reflected image, and then compare it with the image reflected from the human eye of the same kind of light.
Another way is to train dogs to "tell" scientists the world they see. In the experiment, the scientists showed the dog several groups of colors, each with three colors, two of which were the same. With a little bit of training, the dog would use its nose to point out to the scientists the light of that particular color in each group.
Scientists simply need to change the color of light and repeat the process to come to the conclusion that the world is black in the eyes of dogs. White and dark gray, mixed with medium and long wave red and yellow light and short light wave blue light, the world is like the picture in black and white TV, only the brightness of black mortar is different, and the color change cannot be distinguished.
The reason why guide dogs can distinguish red and green signal lights depends on the brightness of the two lights. The dog's ability to distinguish gray is very subtle, depending on this ability, it can distinguish the light and dark changes on the object, and produce a three-dimensional visual image.
The relationship between vision and variety
Short nosed breeds (such as Bulldogs) can see a longer depth of field, while long nosed breeds (such as shepherd dogs) have a wider field of view. In addition, the shape of the dog's skull and the length of its nose can also affect its vision. It is generally believed that most dogs are slightly myopic. A few have hyperopia, but the degree of myopia and hyperopia are both basal.
Tips for eye protection for animal owners
When a foreign body is found in the dog's eyes, it should be sent to a pet doctor for diagnosis and treatment as soon as possible. It is not allowed to wipe out the foreign body with cotton swab or finger, so as to avoid eye injury. In addition, if you find that you often scratch your eyes, shed tears, blink, red eyes, blurred eyes, colored secretions, or protruding third eyelids, you should seek medical advice as soon as possible.
When carrying your dog on the bus, you should forbid the dog to put its head out of the car, so as to avoid serious injury to the eyes caused by the impact of insects. When using any product containing alcohol (such as ear cleaner), avoid touching the eyes. When taking a bath for dogs, avoid lotion bubbles entering the eyes. When you wash your eyes, you can use Erythromycin Eye Ointment to cover your eyes and put your head back slightly to prevent the lotion from entering your eyes. In case the lotion enters the eye, use a large amount of sterile physiological salt water to rinse, and see a doctor if necessary.
