Horses eyes are usually covered with transparent mesh to prevent flies from biting at their eyes. This fly-mask allows the horse to see and hear just fine but prevents flies from gathering on their face and eyes.
Horses don’t see the world in the same way humans do. Because they are prey animals, horses rely on their monocular vision to scan their surroundings for predators. Predators use binocular vision to focus on their prey.
Blinkers and blinders are the two different ways the field of view might be limited. Don’t worry though, the horses can still see straight in front of them and are not completely blinded.