Glass Eye is a passive item added in The Binding of Isaac: Repentance (v1.7.5). +0.75 damage +1 luck. Glass Eye: Picking up a second copy of the item gives Isaac a unique costume with both eyes replaced. The damage up and luck up stack as expected. Glass Eye is one of the few items that will give Isaac a unique costume when two copies are acquired, along with Brimstone and Guppy's Eye.
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