What is put on the side of a horse's eyes in the picture?

Ken, blinkers in the UK

blinders...not blinkers

Blob, I've only ever heard them called blinkers. It's a uk thing 😊

Blob, I agree. never heard them called blinkers before. only answer that made any sense, still a guess.

Blob, out of curiosity what do you yanks say instead of someone having a "blinkered view" of something? It means having a narrow, parochial attitude like only accepting what you know as correct.

first time hearing them referred to as blinkers. blinders, yes.