I have been dealing with CRPS for 6 years now & I too began having eye problems but it was more of a blury sensation than double & also eye pain. It is difficult to get doctors to connect the two or to connect anything else to it & even harder to get insurance to believe that, but there are many things that get heaped upon us after having this disease.
Certain medications definitely make my eye issues worse, especially anti-seizure meds. I also seem to be allergic to most of the types of meds they have tried & have bad reactions to many others. Since I never needed any of these before I didn't know until I broke out in hives, rashes, sweats, vertigo, etc. again & again with every new med, so now I stick to strictly pain meds & refuse anti-seizures & any of the anti-depressent types they often prescribe & the hives finally subsided.