Lens of Truth

The Lens of Truth, Is an item in Legend of Zelda: Ocarina of Time and Legend of Zelda: Majora's Mask.

Obtainment
In ocarina of time the lens of truth is obtained by beating the dead hand at the bottom of the well in Kakariko Village. It is optional but would make the Shadow Temple next to impossible.

In Majora's mask it can be found in a treasure chest in Snowhead.

Uses
The uses of the Lens are simple: It allows you to see fake walls, floors and items. it also allows you to see invisible people, creatures, and items, such as Bongo Bongo or the Poe that guides you through the Haunted Wasteland.