Infiltrative ophthalmopathy
Infiltrative ophthalmopathy is found in 5-10% of patients with Graves disease and resembles exophthalmos, except that the blurry or double vision is acquired because of weakness in the ocular muscles of the eye. In addition, there is no known correlation with the patient's thyroid levels.
Source: Wikipedia — Infiltrative ophthalmopathy (CC BY-SA 4.0)