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How to protect an injured eye on a horse
Put a fly mask on the horse.
You can protect the injured eye by putting a fly mask on the horse so dust and debris cannot get into the eye. A fly mask is a mask made for horses with two round protective patches, one for each eye.
You can find fly masks at horse supply stores or online. To put the fly mask on the horse, have your horse to lower their head a few feet from the ground.