Most of the time, a horse has "monocular" vision. This means a different image is seen by each eye so that a horse is seeing two different pictures at the same time. A horse can also have "binocular" vision. Binocular vision is when both eyes work together to see one picture (humans have binocular vision). A horse only has binocular vision when it is looking down its nose.
 A horse can see better at night than a human. However, it takes a horse’s eyes longer to adjust from light to dark and from dark to light than a human’s.
Horse’s height is measured in units known as "hands." One hand is equal to 4 inches. A horse is usually considered to be 14.2 (14 hands, 2 inches) or taller when mature.
The oldest horse on record is "Old Billy," an English barge horse. He was 62 years old when he died, living from 1760 to 1822.