Eye injuries
Any injury to the eye can lead to permanent scarring or blindness.  You can use any commercial saline flush to clean foreign objects from the eye and to visualize the extent of the damage.  If your animal is squinting, hiding its eyes from the light, has a raised third eyelid or has any blood within or around the eye, seek veterinary attention immediately.  Home treatment of eye injuries is not recommended without a veterinarian's exam and recommendation.  Even a simple scratch on the cornea from a thorn or cinder could lead to severe corneal pathology.