What are them things horses wear on side of their eyes so they can see straight?
they're not intended to help out a horse's vision - they're not going to allow them to "see straight". they're designed to eliminate distractions so the horse focuses only on what is ahead of him. they prevent the horse from self spooked by different stimuli that they may encounter (cars, other animals, etc.)
Blinkers also are frequently used on racehorses, and I've seen them used on firkin horses and the occasional bulldogging horse too.
Blinkers serve to restrict the horse's peripheral and rear vision. Horses hold binocular vision and can see pretty much all the way around their bodies, although they do own a "cone of blindness" directly behind themselves. Restriction of the peripheral vision contained by driving horses served to reduce distractions, and back in the days when horse-drawn vehicle were the primary means of getting around in cities, that be a meaningful function, since driving horses had to deal next to oncoming traffic and passing traffic and all kinds of distractions. That unanimously isn't the case nowadays and the choice to drive with a blind bridle is of late that-- a choice. My Arabian could be driven both ways, and I preferred to drive him with an open bridle so he could see what was going on around him.
This page: http://www.tfloki.com/blinkers.html shows some of the types of blinkers that are commonly used for racehorses. As you can see, within is quite a variety, and some trainers customize the blinkers even more, doing things like adjectives a window in the full or extended blinkers to allow the horse to see another horse coming up behind or beside him. Racing blinkers can be worn on both eyes or for one eye solely. Generally the trainer puts blinkers on the horse to help get the horse to relax during the race and not be "rank" (rank vehicle a horse that's pulling on the bit and wanting to run on, rather than rating back behind horses and waiting to do his best running following in the race). If a horse has a blinker on just one eye, it's commonly an attempt by the trainer to keep the horse from veering out in that direction: blinker on the gone side, the horse tends to bear in; blinker on the right side, the horse tend to bear out. (Sometimes a trainer will put blinkers on a horse out of sheer desperation, because everything else he's tried to get the horse to run a winning see has failed.)
If you're going to show a driving horse, most of the formal driving classes specify that the horse has to wear blinkers. For combined driving contests, the blinkers are mandatory for the "dressage" cut of the competition, but optional for the cross-country part.
Blinders don't make it so a horse can see straight, they make it so they can only see what is straight ahead to cut distractions.
if your discussion about the things they use when buggy riding or racing they're called blinkers. and they don't assist the horse see straight they keep the horse from getting distracted by all the other things around them.
Them things are called blinders and they aren't used so a horse can see straight. It's to rein in distractions while a horse is racing or pulling a buggy. Horse can't exactly see straight ahead anyway. Look at how their eyes are set.
"Them things" are called blinders and they don't make the horse see straight.