TopicCarbine: Champion Australian Racehorse
Horses' large eyes provide them with Sprinter 7 a great advantage, as they enable the animals to detect even the slightest motion, which is why they can be uneasy on very windy days as well as when they are at a racing event. Horses move their heads up and down to get a better view of things that cause them to feel concern, as they enjoy better depth perception when the head is held at a certain angle. In general, they see best when binocular vision is employed. To get a feel for how horses see, close one eye and walk rapidly toward a wall. You'll notice that it is hard to tell how far you are from the wall. When you open your eye, you'll be instantly rewarded with better depth perception, courtesy of your own binocular vision.
At one time, horses were believed to have poor vision, but this is only because early researchers didn't understand how horses see. In addition, they were originally believed to be short sighted, but this too has been proven wrong. If you're watching a horse as he sees something moving, he'll lift his head and gaze into the distance, employing his long range vision, which is even better than our own. Researchers using the Snellen scale to compare horse vision with human vision have determined that horses have 20/30 vision, while a human with perfect vision has 20/20 vision, a dog has 20/50 vision, and a cat has 20/75 vision.