Whether or not your attack hits, your psionic assault makes your foe think you blinded it.

Daily   ✦     Charm, Psionic, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Charisma vs. AC

Hit: 1[W] + Charisma modifier damage, and the target is blinded (save ends).

  Aftereffect: All creatures have concealment against the target, and it takes a -5 penalty to Perception checks (save ends both).

Miss: Half damage, and the target is blinded until the start of your next turn.

  Aftereffect: All creatures have concealment against the target, and it takes a -5 penalty to Perception checks (save ends both).

Published in Player's Handbook 3, page(s) 28.