JN is a 16-year-old boy who presented with double vision on looking to the right for several weeks. Examination found vision in both eyes of 20/20 and mild proptosis of the left eye compared to the right. There was mild lid lag of the left eyelid. He was found to have 15 prism diopters of exotropia on right gaze. Forced duction testing was positive for restriction of adduction on the right. He had no history of diabetes or thyroid abnormalities.
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