"Encased in a patina of rust, tiny gearworks and lenses form an eye-shaped machine."
The Mechanical Eye is the eye once given to the old Master Sneak Thief by the Hammerites when he lost his eye to the Trickster. At some point the thief was captured and taken to Moira Asylum.The Sneak Thief set up multiple secret caches of items inside the asylum containing ancient coins, strange paintings, and other bits and bobs. One cache he placed inside of some vents just above the Old Prison area. The Archivist found one of these caches and began to hear whirring clicks, like a heart nearby. Realizing the clicks were connected to the Sneak Thief The Archivist decided that he wanted whatever it was for himself. The clicking lead him to a second cache but he never made it to the eye, it can be assumed he either perished or became a Freak. The eye can now be found in a hanging cage in the Old Prison Reformation area but there is no evidence to show if the Sneak Thief died there or escaped.
- This is one of the most iconic items from the original Thief Trilogy to make a return.
- The peg coming out of the back of the Eye in Thief 4 only appears in blueprints in Cutscene 5 in Thief 2, but can't be seen directly in the angles shown in the game which only show the front of the Eye. This peg is presumably how the eye attaches to Garret's ocular nerve.
- The eye was made by Karras the main antagonist and villain in Thief 2, he was the father of the Mechanist order of long ago. Karras likened himself to basically being the Master Builder Incarnate on earth, or at least his will.
- Garrett's mechanical eye was given to him by the Hammerites, after his natural eye was plucked out by Viktoria, consort of the Trickster. The Hammerite that gave him the eye was Brother Karras, who went on to leave the Hammerites to form his own splinter group. Karras gave him the eye in the hopes that an allegiance could be formed between the two.