Readds the clusterbang.

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

code/modules/chemical/Chemistry-Reagents.dm

@@ -1355,6 +1355,7 @@ datum
 				M:eye_blurry = max(M:eye_blurry-5 , 0)
 				M:eye_blind = max(M:eye_blind-5 , 0)
 				M:disabilities &= ~1
+				M:eye_stat = max(M:eye_stat-5, 0)
 //				M:sdisabilities &= ~1		Replaced by eye surgery
 				..()
 				return

code/modules/mob/living/carbon/human/life.dm

@@ -992,10 +992,18 @@
 					if (druggy)
 						client.screen += hud_used.druggy
 
-					if (istype(head, /obj/item/clothing/head/helmet/welding))
+					if ((istype(head, /obj/item/clothing/head/helmet/welding)) )
 						if(!head:up && tinted_weldhelh)
 							client.screen += hud_used.darkMask
 
+					if(eye_stat > 20)
+						if((eye_stat > 30))
+							client.screen += hud_used.darkMask
+						else
+							client.screen += hud_used.vimpaired
+
+
+
 			if (stat != 2)
 				if (machine)
 					if (!( machine.check_eye(src) ))