Horses have long been domesticated by people, but we still do not know much about these animals. For instance, many people think that horses are colour blind and can only see in shades of grey. However, it is not true. Horses do see colours, but they may not see them as vividly as we do. This is because they can only see two of the three visible wavelengths in the light spectrum. This is somewhat similar to the way people who are colour blind see. Your horse doesn’t see the colour red, but they can see blues and greens. So, the lovely red apple or the bright orange carrot you offer as a treat may actually appear brownish or greenish to your horse.
Horses have the largest eyes of any land mammal. Using both eyes, horses see virtually 360 degrees and the horse almost has a complete sphere of vision around its body with only a few small blind spots. They are not a problem for horses as by moving their head they see what they need perfectly.