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    Usually the double vision in Graves is caused by esotropia (eyes turning in) and/or it is vertical diplopia. This means you at first see double looking to the sides at distance, then in central vision at distance, not at near like when reading. Images can also appear vertically double or even at an angle. Eyes may look crossed all the time and as the double vision is caused by the muscles swelling and taking up space in the orbit, your eyes will actually bulge out of the orbits. I am no doctor but your eye symptoms could also fit myasthenia gravis which causes eye muscle fatigue or a neurological problem.