I am exceptionally paranoid now about getting any hot metal,flux,or sprays like carb cleaner or brake cleaner in my eyes ,since I had cataracts removed from both my eyes and they installed prescription plastic lens implants in them to replace the ones lost due to the cataracts..even specks of rust,dirt,or any other crud could lead to having to undergo eye surgery again to replace the damaged lens(s)...
Though my eye doctor tries to allay my fears by saying "you should be able to do whatever you used to do without fear",I still don't want to push my luck..they seem much more sensitive than they used to be to any forigen objects or chemicals,and especially bright lights like welding arcs,or LED's,and once you have had to live with comprimised sight, you dam sure dont want to risk going blind,believe me..
I'm not as eager to lie under a vehicle and work on one now,and my ambition to weld or braze things is not exactly high either--even just heating up a rusted bolt or nut often produces a "pop" that splatters molten metal and rust in your eyes...and I have a really hard time seeing thru goggles or safety glasses,I have to use reading glasses up close now to see well too..
Another side note,never use brake cleaner to clean off something your going to weld or heat up ,it'll release a deadly gas that can permanently cripple lung tissue or suffocate you..