Oh gawd -- now you added an additional worry for me...
You'd know for sure if you were "exposed" to the welding light - trust me - I've had the dreaded welding flash more than a couple of times (self inflicted of course) and it is not a pleasant few days.
Think of going to the beach - open your lower eyelid like a guy putting a pinch of chew in his lip - but you're going to do a pinch of SAND... Closing your eyes doesn't help either... UGH!