Horse eyes have a totally different vision than human eyes.
Did you ever get annoyed when your horse sudendly spooked although you passed that same spot a million times before?
The horses eye is positioned at the side of the head. This gives the horse almost 360° of a visual field. It allows them to constantly scan their environment for predators when they are grazing. Even if they come from behind them.
Their eyes are able to observe sudden changes and movements. The horse also registers very small changes in its enviornment.
This is why they all of a sudden spook although they passed that same spot before without any sign of fear.
Horses have stereoscopic vision only in a small area infront of them. In this zone they can judge distances.
The horse vision to the side is monocular and probably not very sharp.
In daylight horses more than likely see less colours than humans. It seems that they can see blue and yellow best.
Did you ever wonder how horses see in darkness?
Horses can see better at night than humans. Their eyes have three times as many receptors for light on the retina.
These receptors are very light sensitive. They capture the differences in light intensities and send them to the brain.
They also have a carpet called the `Tapetum lucidum´. It lies behind the retina and reflects the light, enhancing every bit of light that hits the eye!
They more than likely see black and grey colours at night, just much clearer than we do.
