If anything I think an NVG would help you, of course you would still be extremely hindered by not being able to hear anything from the bang of the FB grenade.
Like stated, NVGs use screens which typically use infrared sensors for you to see in the dark, and they are also sometimes one eyed, so yes if it was one eyed you could be screwed, if it was two eyed, they typically have a rubber shield on them to allow you to see stuff below you (dashboard of a car, or if you have to change the ammo in a gun), so there is some light seepage.
Here, look at it this way, if a big bright explosion goes off on your tv from a movie, does it blind you? No, your screen can only be but so bright, did it blind the filmmakers and actors? Probably.