The entire spatial area from which the complete visual image of an eye is formed is known as the field of vision .
In the horse, it is about 215 degrees for each eye. The wide-set eyes of the horse enable it to enjoy a panoramic field of vision even to the extent of seeing everything around itself with slight head movements.
Only what is immediately behind the horse's hindquarters is outside its field of view, until it moves its head and neck.
For more information, see Horse Vision.
