I don't know where the quote is now, but I am 100% sure I read Bort confirm that Super Vision only works in the specific situations mentioned in the description, which is to say when a player is trying to avoid being faked or reading a developing offensive play to get in position. So unless your QB plays on defense, the only thing Super Vision will do is help him avoid being faked out by defenders returning an INT or fumble.
SAs are not just stat buffs that are randomly activated before a play and boost one or more stats for that play. They are built in to certain roles the games makes in very specific situations.
For example:
A DB doesn't check before the start of the play to see whether or not Super Vision activates and boosts his vision stat. Instead, when he attempts an action that checks for Super Vision on the player, a roll is made to see if he gets a bonus to his vision for that specific action. It is possible a player could fail to activate Super Vision on a vision check and allow his receiver to make a catch but then successfully activate Super Vision to help avoid being faked out by the receiver that same play.