Good to Know - Topic
Good to know ... !!
Eyes, Horse Vision
"- Horse can see almost 360 degrees around himself because his eyes are on the sides of his head. That's why he notices objects or movements behind him that you (with eyes on the front of your head) can't even see without turning around.
- There are two blind spots. A horse cannot see immediately in front of his nose (for about 3-4 feet.) and he also cannot see between his hips behind his rump for several feet. ( That is the reason that approaching a horse from directly behind his tail is dangerous. He does not see you coming. When you reach him, your touch or motion so unexpectedly close can trigger a seemingly unprovoked kick.)
- Horse sees most things with one eye--monocular vision
- Only about 65 degrees from center is highly focused and binocular.
- How to know whether he's looking with one eye or two? As he tries to focus with both eyes on something, he pricks both ears straight ahead.
- Horse has two ways to bring objects into focus--by using tiny muscles to change the shape of his eye's lens (which is the only way you can focus)--or by changing his head position to direct the image to a different part of his eye.
- Horse's extravagantly big eyeball (largest of any land mammal's) magnifies everything 50 % larger than we perceive it.
- Horse sees much better at night than you--even better than your cat!
- BUT horse sees some colors (yellow, green, blue; red is iffy)--but this color vision diminishes with decreasing light. That's why he may tend to bump into you, the gate, or his pasture mates if you're bringing in your horses around twilight: His color perception has dimmed, but his night vision hasn't quite kicked in yet."
by Practical Horseman