Do dogs have peripheral vision

Answer 1

The human eye sees because there is an array of receptor cells called rods and cones at the back of the retina. Rod are comprised of one neuron connected to an array of receptors. As such, rods are very sensitive to motion and the existence of light, but don't perceive colors. Cones, on the other hand, are one neuron per receptor, and it's with cones that we perceive colors. There are three kinds of cones in human eyes that correspond to the colors red blue and green. Humans, then, are trichromats; our color vision is based on three colors of light and their various combinations. Cones don't pick up light or motion as well as rods, but they do perceive color. This is why the stars look appear to be white to us: they produce enough light to activate our rods, but not enough to activate our cones, so we don't see the colors that are there.

Dogs have very few cones, but a plentitude of rods. This means that dogs see light and motion very well, but don't perceive color as well as humans. Unlike humans, the cones dogs have detect only two colors: blue-violet and yellow. They have a hard time distinguishing red from grey. So dogs see better in low light situations, but don't pick up all the colors humans do.

Also, dogs' eyes are generally more spread out than humans', so they see as much as 270 degrees around them, as opposed to humans which get only 180 degrees. But the human field of vision overlaps more, so we get better depth perception than dogs, and our long distance vision is better. Human normal sight is measured at 20/20. Most canine breeds, however, don't see much better than 20/70 (I exclude Labradors, which get very close to 20/20).

Also, dogs have a reflective structure in the back of their eyes that we think reflects light back through the retina, so their low-light vision is even better.

Dogs can see in much dimmer light than humans. This is because the central portion of a dog's retina is composed primarily of rod cells that "see" in shades of gray while human central retinas have primarily cone cells that perceive color. The rods need much less light to function than cones do.

Dogs can detect motion better than humans can.

Dogs can see flickering light better than humans. The only significance to this appears to be that dogs may see television as a series of moving frames rather than as a continuous scene.

Dogs do not have the ability to focus as well on the shape of objects (their visual acuity is lower). An object a human can see clearly may appear to be blurred to a dog looking at it from the same distance. A rough estimate is that dogs have about 20/75 vision. This means that they can see at 20 feet what a normal human could see clearly at 75 feet.

Dogs are said to have dichromatic vision -- they can see only part of the range of colors in the visual spectrum of light wavelengths. Humans have trichomatic vision, meaning that they can see the whole spectrum. Dogs probably lack the ability to see the range of colors from green to red. This means that they see in shades of yellow and blue primarily, if the theory is correct. Since it is impossible to ask them, it is not possible to say that they see these colors in the same hues that a human would. Whether or not the ability to see some color is important to dogs or not is hard to say.

Read more: Vision - How dogs see

Answer 2

Dogs have binocular vision. They have two eyes with significant overlap in the areas seen by each eye. This gives depth to the image processed by the brain. As predators, dogs need to be able to judge distances accurately when pursuing and pouncing on prey. Binocular vision gives them this ability.

Prey find a wider field of vision with minimal overlap helpful as it allows them to see predators coming.

Answer 3

no they don't

Answer 4

Not really. They have great side vision.

Answer 5

Yes