If you're perception-capped (1153 feet on a Stalker), you won't be able to see a stealth-capped Stalker unless they're within 10 feet of you, and a stealth-capped VEAT unless they're within 273 feet of you (353 really, since VEATs can't self-cap stealth unless they've got external buffs or are running Invisibility). WP, SR, Nin, and Dark have +perception in-set so when combined with the +perception IO and Tactics you can get pretty close to the cap. (The above paragraph assumes you're a Stalker, since that wasn't quite clear from your post.)
If you're not a Stalker, the numbers would still be the same, but it would be incredibly unlikely that you'd see a stealth-capped Stalker because odds are he'll be moving and won't stay next to you that long. Best solution to prevent being AS'd is to always keep moving. Perception doesn't hurt, but it's not the simplest solution.
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"One day we all may see each other elsewhere. In Tyria, in Azeroth. We may pass each other and never know it. And that's sad. But if nothing else, we'll still have Rhode Island."
"One day we all may see each other elsewhere. In Tyria, in Azeroth. We may pass each other and never know it. And that's sad. But if nothing else, we'll still have Rhode Island."
I know i'm newb to all of this and i apologize to all of you who have to read this >.< but what % of perception should i have to have a good chance to see Stalkers/Widows in pvp and by that i mean, to have enough chance to see them before they can pull off a successful AS ( i know most are encouraged to go for the regular crit strike and not the AS due to efficienc but still)