Just a suggestion.

If you feel the need to trim your dog's "bangs" so it can see, this may be a small clue that your dog is actually DUE for a haircut.  The hair growing over your dog's eyes, actually doesn't grow any faster than the rest of his hair.    However, if you need to trim his face, because there is just no way you can get him into the groomer, and he will likely run into a wall if you don't, PLEASE, just cut the hair hanging down in front of the eyes, not the entire top of the head down to the skin.  I can't fix that...when you finally do bring him in.

Ok, once in a while I do cut my own bangs..but that is different, right?