Eye of the UnseenEquipment 8
Source Pathfinder Lost Omens: The Grand Bazaar
Price 450 gp
Weight light
This prosthetic eye was designed by elven crafters but comes in a range of appearances for different ancestries. While wearing the eye, you gain a +1 item bonus to visual Perception checks.
Activate 
command, envision
Frequency once per day
Effect You focus on the eye to see the unseen. The eye casts See Invisibility on you.
Effect: Eye of the Unseen
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
DivinationThe divination school of magic typically involves obtaining or transferring information, or predicting events.
InvestedA character can wear only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.