If you wear glasses and can't afford prescription safety glasses, you can always use safety goggles. You can get a pretty nice pair at home-depot for 20 dollars. I have had these for a year and they are pretty scratch resistant, never fog on me, and are quite comfortable. If you can stand to wear these "stylish" bad boys in public then they are a perfect choice.
http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053