The 'Eye' is just the symbol of Sauron, what his evil will 'looks' like to those who might view it. Sauron has left Barad Dur in the past. For a time, he had taken up residence in Dol Guldur, in southern Mirkwood. He was driven out around the time of the battle of five armies, he withdrew and rebuilt Barad Dur at that time. But Sauron, without the ring, could not take physical form anymore. He was a spirit of evil will and domination, that took action through his servants.
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