So you want... p1 can see vision of only himself (not p5 or p6 or p8's vision).
But p5, p6, p8 all can see p1's vision.
If that's what you want, then I think your triggers are correct.
But, if you want:
p1 can see vision of himself, p5, p6, and p8;
But p5, p6, and p8 can only see their own vision - they can't see what p1 or each other see.
Then you want p1 to run "turn on vision" for p5, p6, and p8
and p5 runs "turn off vision" for p1, p6, and p8
and similarly for p6 and p8.
Make sure you double check the tutorial:
http://www.staredit.net/index.php?tutorial=64