2. Dogs, also known as "dogs", are scientifically called "domestic dogs". It is also called "six animals" with horses, cows, sheep, pigs and chickens.
3. The dog's vision is only about three-quarters of that of human beings, and among all animal species, the dog's vision is about medium. The dog can only see 25 degrees with one eye, so it can't see the nearest distance ahead. The lens of a dog's eyeball is relatively large and deformed like a horse's eyeball, so it is impossible to adjust the sense of distance. Twenty or thirty meters is probably its limit. Dogs have a special ability to detect moving objects; They can detect images that move 70 lines per second, while ordinary TV images move 60 lines per second. Dogs have better eyesight than people in dim light. Dogs are natural carnivores and live by hunting, so they also have considerable vision in the dark. Dogs' eyes can see short-wavelength colors. In addition, the dog's cornea is bigger, which allows more light to enter the eyes, so it is easier to see things in dim light. But in the darkness without light, dogs can't see.
The difference between human vision and dog vision lies in the response to light. The human eye reacts to the three primary colors (red, green and blue) that produce various colors. Dr DennisBrooks, associate professor of ophthalmology at the College of Veterinary Medicine, University of Florida, said that dog vision is different from human vision. Dogs can't tell colors like people, but they can see some colors. Dogs can distinguish different shades of blue, indigo and purple, but they are not particularly sensitive to high chroma colors such as red and green in the spectrum. Dr. Brooks' research shows that red is dark for dogs and green is white for dogs, so the green lawn is white for dogs.