I have noticed before today that if my eyes are relaxed I have double vision (especially when driving) but I can make them focus. I am not certain if this true double vision or not? Anyone have any ideas. I have also had a dull headache for several days and the muscles in my neck and back are tense. For 9 months I have been having problems with my left eye. In the mornings it takes awhile for me to be able to open it.