One of the hazards of working on any vehicle , especialy older ones that are rusty , and have a chance of sending particles at you , as well as tools breaking and sending things flying at you.
Thats why I wear a full face shield now when I do stuff like that.After a couple of times flying particles get up under the safety glases and into the eye , its just not worth it to take a chance on losing part of your vision.Luckily my experiences they got the stuff out , and I only had to wear a patch for a couple of days.The full face shield has saved me a few times , and for the little expense , well worth it.I even wear it just crawling under the trooper because of all the dirt , rust , and old oil and stuff under there than can fall in your face.