That happens to me all the time, but all I do is force my eyes back into focus.
I don't understand why you need a doctor.
The only thing I've ever taken for eye health, that seemed to work is lutein. I have no idea what your problem is though. That's probably more for nerve health than anything. Unsure exactly.
If you think it is a muscle issue, my guess is trying to find some ginko leaf, in caps or tea or whatever. So long as you aren't in risk of a stroke from being extremely high strung with high blood pressure, and like 70+.
It will basically push more blood/oxygen through your brain with better circulation. I thought it helped with being more alert and aware, but it could probably be good for eye sight as well. I think I may have remembered it being mildly beneficial.
http://www.nlm.nih.gov/medlineplus/druginfo/natural/333.html
Ginkgo been tried for eye problems including glaucoma, diabetic eye disease, and age-related macular degeneration (AMD).