Perhaps also get some eye-drops (there are specific ones) in case you get a flash-burn anyway...
They are cheap, they help a lot, and it's a good idea to get em beforehand as you shouldn't drive or walk around with burned eyes, eh?
Also, from my experience:
Mild flash-burn: Eyes are stoned red, they might burn somewhat, they are over sensitive to light, it might feel like you have dirt/sand in your eyes -> Usually goes away after a 1/2 day
Strong flash-burn: Eyes are demon red, you can't even bear room lighting, eyes hurt, strong feeling of having dirt/sand in your eyes, degraded vision -> Go see a doctor, really!