I would think that if you are seeing double, you are hitting the "blind spot" in both eyes, which is hard for the brain to compensate for..
Ideas would be to do a simple subtraction of one eye flare out, this would break the "double vision " issue..
Human eyes use the blind spot in the center for not just compensation, but for binocular "focus" as well.. Concentrate hard enough and you can see each blind spot in the eye as a ghost spot..
It has been said that the blind spot is the weakness to the mind, it could theoretically allow information to be projected in the blind spot at a fast enough rate, that the brain will process it without the consciousness being aware of it..
This was one of the hypothetical's shown in the movie "lawnmower man" (thought the rest was still very much left wing hyper reality lol)...