Increases AC
Adds +3 to AC. If the user is currently wielding a Goblin-made weapon, the AC bonus becomes +4 instead of +3.
Adds +3 to Dexterity (thus, depending on prior Dexterity score, either +1/+2 To Hit with ranged attacks, either +1/+2 to AC, and either +1/+2 to Reflex saving throws)
A rogue wearing these lenses may sneak attack while wielding a bow or crossbow, but not any other Ranged weapon. An assassin (rogue sub-class) wearing these lenses may perform an assassination while wielding a bow or crossbow, but not any other Ranged weapon.