Blindness
Dogs with one blue eye suffer from the misconception that eye must be blind. This generally isn’t the case. Dogs living with heterochromia generally have accurate canine vision, which is much different than that of a human’s vision. If an owner is wondering whether their dog suffers from partial blindness and is afraid or embarrassed to ask their vet, a simple sight test may be performed. Have someone sit behind the dog and cover one eye. Stand in front of the dog with a large colorful bouncy ball. Drop the ball, if the eye follows the ball the dog can see well enough. Switch eyes and try again.