As long as the wearer is wielding a Common melee weapon, all their melee attacks deal +1 damage.
Common Weapons
Wearer gains +1 Damage with missile attacks when wielding a Common rarity missile weapon
Slot Note: Each character has one Eyes Slot. Even though this item only covers one eye, it may not be equipped in conjunction with any other item occupying the Eyes slot unless you also have a token that allows you to equip more than one Eyes Slot item.