We tend to put the blinkers on after the first hitch to cart. Horse KNOWS things are going on around him, stuff is following. He has seen it all in his training, is not frightened. Blinkers focus his attention forward and he listens for commands. Less likely to get distracted with less vision area to view. This doesn’t mean blinkers are tight to the head, with only a tiny slice to view straight ahead. Blinker are so that he doesn’t have as much vision as he would in an open bridle. Styles of blinkers can change the viewing area he gets as well.
Horses “read” body language from you, notice things going on all around them, close and far away. Horse then reacts to these messages according to his training and previous experiences. If he doesn’t see this other information, he is less likely to try to HELP in making choices while driven. His choices are not usually the best ones, will often creat a problem situation.
Most driving horses are trained in regular riding bridles, Open, meaning no blinkers. This is fine as a training aid, no vehicles attached to the horse. Once the vehicle is part of the training, WE feel the horse needs blinkers so he is not reading and reacting to US and the body language we use while training. He can’t anticipate, move early, if he doesn’t see the whip move accidently or the reins being changed in your hands, has to wait for the voice directions.
Sorry, we use right and left to tell which way to turn. Have ENOUGH trouble keeping that straight in competitons!! I have never figured out why folks use substitute words for giving horse simple directions. I can’t keep Gee and Haw correct ALL the time either, which is why we don’t use them. Substituting words just is too complicated for us, when we need to be quick and accurate at speed. Could be we are speech dyslexic, I know I use the wrong words enough just talking on some days!
At our farm we use Come to mean bend harder, for tightening a turn. Come Right, or Come Left, means turn in that direction. Come, Come, Come, spoken sharply means they better be bending hard, driving, almost pivoting in place to get bent back around the way they came from. It compresses the energy to be released when driver is ready. These are more advanced horses, you have to teach this move over time. Kind of a whiplash effect on the Navigator at the back of vehicle, but that is what gloves and grippy wrapped handles on carriage are for!!