Understanding Dog Eyes And How Dogs See

Dog Eyes Compared To Humans

Dogs are physiologically very similar to wolves; because of this, their vision is well adapted to a life as a predator. To understand this adaptation, we need to learn a little about the cell types in the retina. There are two types of light receptor cells in the retina - rods and cones. The rods are sensitive enough to detect very small amounts of light, and are very useful at night or in dim light.

Cones don't work well at all in dim conditions, but they're able to determine color. The retina in dogs consists of 90% rod cells, so they see extremely well in low light conditions, but they can't see colors as well as we do. This isn't important to them, because night vision is more useful to a predatory species.

Although they are few in number, the cones in dog eyes fall into two groups. The first group is good at detecting blue-violet light, whereas the second is more sensitive to light at the yellow-green end of the spectrum. So, dogs can see blues, purples and yellows, and not much in between. Red and orange shades will appear yellow.

Dogs, like us, are more aware of moving objects, rather than something that is static. It's quite possible they won't even notice an object that isn't moving, particularly if they can only see it out of the corner of their eye.

If you compare the shape of your face with that of your dog, you'll notice that there is a big difference in your eye position.

Your dog's eyes are positioned more towards each side of his face, compared to your eyes. This means he has a comparatively wide field of view, and will find it easier to spot prey that's off to one side. This is another useful adaptation to a predatory lifestyle.

A potential disadvantage of having eyes on each side of your head is that there is less overlap in each eye's field of vision. This means dogs are less able to accurately figure out how far away something is; their depth perception isn't as good as ours. They also find it very difficult to focus on an object that's very close to their eyes.

Taking all this into account, we can paint a picture of how dog's see compared to our own. They can see moving objects better than we can and have better night vision. They also have better peripheral vision, that is the ability to see things off to one side. On our side, we have better color vision and we are more able to focus on very close objects.

These characteristics of dog eyes and vision are less important, since he doesn't have to hunt for his dinner. However, they would have served him well if he had to rely on his own senses to capture a meal.

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