I am from india but currently lives in japan. My father visited here 2 months back. But from last 7 days, he noticed below things 1. With both eyes open, if he sees straight more than 20-25 cm, he can see double vision/any object double horizontally. 2. With only one eye open at a time, there is no problem in vision. No double vision. 3. With both eyes open, if he sees the object with cross eyes then there is no problem for vision. However, he feels pain in the right eye. 4. He is also having small pain above the right-side eye. 5. His eyes looks slightly crossed from front. We had a web call with indian online service eye expert doctor and he suggested that the reason for this could be due to high sugar level which cause right 6th nerve palsy. He suggested to reduce sugar level and take "neurobion forte 30s" tablet which will improve double vision and cross appearance. I am very much tensed. I would appreciate more if you could please guide me with your valuable suggestions. Thank you.