freemotion
Self Sufficient Queen
You can also buy a blinker hood, sold as training equipment for driving horses. It has a plastic thing that is like a quarter of a sphere that keeps the horse from seeing the cart he is pulling and spooking. They also work great to protect an eye. You can remove the plastic sphere thing from the other side of the hood. It is something to consider if the fly mask isn't enough protection. They are also made with a complete half-sphere that completely covers the eye.