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It sounds that you were able to self - correct the double vision with effort .At times if we are tired then the coordination of the left and right eye may at times lag....the gabapentin is a sedating type medicine and may contribute to this effect ....I think that the sense of double vision was only transient and self - correctable are reassuring that you do not have an eye or neurological problem.
This is commonly reported as a transient type occurrence
So this should not be anything for you to worry about in this instance ...
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Anthony Bray MD