[header] How to protect an injured eye on a horse [title] Put a fly mask on the horse. [step] 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. [substeps] To put the fly mask on the horse, have your horse to lower their head a few feet from the ground.