Re: Why add bright yellow vignetting when wounded, really why?
They pretty much removed it not too long ago, was it added back with this latest patch? (I haven't played any BFV today so haven't noticed yet). I know they made it so your health bar itself would change colour which in my opinion is the better way to go.
The bright yellow haze was first implemented to help players notice when their heal state was active (many players were rushing into combat not noticing they weren't at full health), and as far as I know, there is no way to remove it outright - you'll unfortunately need to wait for the next small patch they roll out.
Edit: ok so I just saw some videos on the matter - while slightly distracting, this is much, much better than the full screen haze I mentioned earlier. I'm sure we'll be able to tweak this later on