Well, welding flash is quite hot and damaging to your eyes. Once got some welding flash into your eyes, it would burn your eyes, dramatically impair your vision, leading to watery eyes, painful eyes, photophobia, even blindness. Anyway, you have to be careful and better yet take a medical exam and take measures. Here I would like to recommend using some breast milk to drop in your eyes for treatment.
It is very bad and dangerous for you to get the welding flash into your eyes which may burn your eyes. You could use the warm compress to make your eyes look comfortable and convenient. You could also use some eye drops to release the symptom and make the eyes keep moisture. You could also do the massage to make the eyes feel comfortable.
It sounds awful! I can't imagine how painful you must be at that time. It might cause tearing, redness of eyes, blurry vision, and sensitivity to light. Leaving it without treatment might lead to even more worse conditions even vision loss finally. The first thing to do, of course, is to wash your eyes continuously with cold running water. The burning sensation might last longer. If you got severe pain in eyes and serious vision problem, even got high temperature in a sudden, I suggest you to see your oculist, after all damages to eyes might make your vision lost for ever. If it is not so serious, apply some cold compress might help you relieve the pain and burning. I once got hot oil in eyes that I was afraid that the cells in my eyes would be killed by the hot oil. Yet finally it seems that no severe vision problem left. So donâ€™t worry too much.