Dogs see equally well both during the day and at night.
However, they are not so sensitive to bright light, so they do not squint in the sun.
How does a dog's vision work
Dogs have wider peripheral vision than humans (their viewing angle is 250 degrees, while humans have 180 degrees), but the sector of best visibility is narrower.
This is because predators need to focus on the prey in front, but not lose sight of their surroundings.
They see them as yellow-gray, but they can clearly distinguish blue-violet and as many as 40 shades of gray.
The tapetum, a reflective membrane located directly behind the retina, is responsible for this.
Dogs do not see in the same colors as humans.
They do not capture all the variety of shades.
Dogs cannot distinguish most colors: until recently it was believed that they see everything in black and white.
Modern research has shown that this is not entirely true: dogs do not see the colors of the red part of the spectrum, and green seems white to them, but they perfectly distinguish blue from yellow.
Scientists from Hungary and Mexico have found that the visual cortex of a dog's brain cannot distinguish the back of its head from the face of both humans and other dogs.
