The world is the same world, but from different visual angles, we see things differently and understand them differently. When people teach their pets to know something, the pet may have something completely different in mind from its owner.

Visual differences between humans and dogs

Dog eyes and human eyes react differently to light. The human eye responds to the three primary colors (blue, green, and red) that create various colors. Dr. Dennis Brooks, associate professor of ophthalmology at the University of Florida College of Veterinary Medicine, said that dogs’ vision is different from human vision; dogs cannot distinguish various colors like humans, but dogs can indeed see certain colors. Dogs can distinguish different shades of blue, indigo and violet, but they have no special sensitivity to high-saturation colors such as red and green in the spectrum. Research by Dr. Brooks shows that red looks dark to dogs, while green looks white to dogs, so a green lawn looks like white grass to dogs.

Canine Retina

The light receptor in the dog's eyes - the retina - contains a large number of columnar cells, which help in dark vision and detection of moving objects. Another type of cell in the omentum is the optic cone cells. The function of the cone cells is mainly to distinguish colors and distinguish subtle details. There is an extra choroidal layer (tapetum lucidum) on the dog's retina, which is highly reflective and can also increase the dog's night vision. Because light entering the eye will hit the photoreceptor on the retina, it may also miss and penetrate the retina; but for pet dogs, due to the choroid layer, even if the light misses but does not hit the photoreceptor, It will still be reflected back to the retina, causing so-called second vision. The choroid layer of dogs is also the reason why dog ​​eyes appear yellow, green, red and other scary colors when exposed to strong light. A small number of dogs lack this structure in their eyes, and the reason is still unknown.

The relationship between dog vision and breed

Short-nosed dog breeds (such as bulldogs) can see a longer depth of field, while long-nosed dog breeds (such as collies) have a wider field of view. In addition, the dog’s skull shape and nose length will also affect its vision. It is generally believed that most dogs are slightly myopic. A few people have farsightedness.

Eye protection tips

When a foreign object is found in the dog's eyes, it should be sent to a veterinarian for diagnosis and treatment as soon as possible. Do not wipe it out with cotton swabs or fingers to avoid damaging the eyes. In addition, if you find that your dog often scratches its eyes, tears, blinks, has red eyes, nebula, colored secretions, or protruding third eyelid, you should seek medical attention as soon as possible. When traveling with your dog in a car, you should not allow the dog to stick its head out of the car to avoid serious injuries caused by insects hitting its eyes. When using any product containing alcohol (such as alcoholear drops), contact with the eyes should be avoided. When bathing your dog, avoid lotion foam entering the eyes; when washing around the eyes, cover the eyes and tilt their head back slightly to prevent lotion from entering the eyes. Different breeds of dogs have different eyesight. Dogs’ eyes are also prone to problems. Dog owners should pay more attention to the cleaning of their dogs’ eyes to avoid infection!