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The Golden Eye is a tool from the OpenBlocks mod. This tool is used to find any naturally generated structure. It has 100 durability, and can be recharged by combining it with an Ender Pearls in a crafting table. It takes roughly 9 Ender Pearls to fully recharge a Golden Eye from a completely uncharged state.
This creates a completely uncharged Golden Eye; it will need to be charged with Ender Pearls.
Sneak+right click while holding the tool, then right click and it will shoot off several blocks into the distance, like an Eye of Ender finding a Stronghold. From this point it can be used exactly the same as an Eye of Ender is used.