Light Touch

Light Touch is a perk in the Fallout: New Vegas add-on Dead Money.

Effects
While wearing light armor you gain +5% critical hit chance and your enemies suffer a -25% critical hit chance.

The bonuses this perk adds are different from the base critical chance modification granted by other perks like Finesse. While Finesse increases your base critical chance, Light Touch merely adds a flat modifier of 5% to the player and a flat 25% penalty to enemies. A modifier is different from base critical chance modification, because it ignores the weapon's critical multiplier, so if the player is wielding a weapon with 5x critical multiplier, the bonus added by this perk will still be only 5%. However, it is also not divided by an automatic weapon's fire rate as normal critical chance is. Light Touch will always add exactly 5% critical chance regardless of whatever weapon you are using.

To calculate the overall critical chance, multiply your base critical chance by the weapon's critical multiplier and ADD a flat bonus of 5% granted by Light Touch (as well as another 5% bonus granted by V.A.T.S. if you are using V.A.T.S.).

The same applies to the enemy critical chance penalty. An enemy with 15% base critical chance wielding a weapon with 2x critical multiplier will have an overall critical chance of 30%. After subtracting 25% for Light Touch, the enemy still has 5% chance to score a critical on the target.