. . . compiled from information on the internet
Unlike the name suggests, horse blinders, also known as blinkers or winkers, do not blind horses. Horse blinders are firm leather squares or plastic cups that attach to a horse’s bridle or hood and prevent a horse from seeing behind and beside him. Horses that pull wagons and carriages wear blinkers to prevent them from becoming distracted or panicked by what they see behind or beside the wagon.
Horses have peripheral vision. A horse’s eyes are located on the sides of his head, allowing him to see a panoramic view of the world. In fact, horses can see a nearly full circle around themselves except for a small blind spot in front of their noses and behind their tails. Blinders cover the rear and side vision of the horse, forcing him to focus only in a forward direction. The reduction in vision for horses wearing blinders is significant and can reduce a horse’s vision from >180 degrees to as little as 30 degrees, depending on the size and depth of the blinders.