Eye damage over 20 units now causes permanent vision impairment,
Eye damage over 30 units now causes permanent welder-vision.
Eye damage is treated by Imidazoline or eye surgery. Full blindness still only treatable by eye surgery.
git-svn-id: http://tgstation13.googlecode.com/svn/trunk@2951 316c924e-a436-60f5-8080-3fe189b3f50e