Dogs cannot see as well as us during the day, but their night vision ability is better than ours
When we watch some movies in the past, if the pictures shown are from the perspective of dogs, then the pictures are often black and white, so we often think that dogs are color blind. There are only black and white in the world. Coupled with the fact that most people believe that dogs are color blind, we are even more convinced of this opinion. However, the world in the eyes of dogs is not as boring as the focus of our imagination, and dogs can still distinguish some emotions well. It’s true that dogs’ vision is not very outstanding.
1. Dogs’ vision is not very good
It can be said that the genius of dogs is "myopia". It is difficult for them to see objects that are too far away from them. Compared with us, the eyesight of dogs is not one third of ours. Of course, this is only compared to daytime. Dogs' vision at night is much better than ours, so they can discover things in advance that we can't see clearly at night.
Some dogs with long faces and pointed muzzles are good at catching moving objects, while some dogs with short muzzles and narrow eyes are more focused on observation. detail.
Two, dogs can not only distinguish black from white
First, let’s briefly understand the photoreceptor cells of the retina, which mainly include cones and rods. Cones can work under brighter light and mainly control vision during the day, and also play an important role in distinguishing colors. Different cones can detect different colors of light. There are fewer types of cones in the dog's retina than humans. They can only distinguish colors within a certain range of wavelengths, such as blue, yellow, gray, etc., but they can perceive the changes in light and shade of each color, such as light blue, bright blue. Color, earthy yellow, etc. It can be imagined that such a world is also very colorful, so the world of dogs is not as boring as we imagine.
Dogs can also see a variety of colors
But dogs lack the visual cones to perceive red and green. cells, so it is similar to our common red-green color blindness. The red and green they see may be one color, but there are changes in shades. However, with certain training, dogs can also distinguish between red and green, which is why guide dogs can cross traffic lights correctly.
However, we don’t need to feel too sorry for this. Although there are certain shortcomings in eyesight and vision, God has also given dogs other things. of excellence. First of all, dogs have larger pupils, a wider field of vision, a higher content of rod cells in the retina, and stronger photosensitive capabilities (rod cells can experience low light), so their night vision capabilities are much better than those of humans. It is also more consistent with moving objects. Perhaps things that we can't see at night can be easily seen by dogs. Dogs are also better at distinguishing light and dark colors than we are. Perhaps many items may appear to be the same color to us, but there are many small differences visible to dogs.
Also we need to understand that even though dogs’ eyesight is not particularly good, they have super sense and hearing, which fully complements the visual function. Without legs, they can sense damage far better than humans. Even if they can't see it, dogs can still live well in a familiar environment, and dogs' senses are indeed very powerful. Not only can they distinguish very small smells, but they can also track the smell even if it is relatively far away. Find the source of the breath through the smallest traces of taste.
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