What is the difference between a walleyed horse and a watch eyed horse?

A horse with a partial blue eye is refered to as walleyed. They aren't a solid blue, and they aren't a solid brown. Instead they often are a brown eye with a portion blue. It is fairly common in Paint horses. While watched-eyed horses are horses that has blue eyes (sometimes they have one dark and one blue eye) it is called a 'watch eye' or being 'watch eyed'.