really small/little chance of ever seeing better than you see right now in that eye. if you are best-corrected 20/80 right now, chances are you are probably going to be 20/80 forever in that eye.
there would only be 'further treatment' in that eye if there was another problem/diagnosis, which you say there is not. for example, if you had a macular epiretinal membrane, you could have a 'peel'. or if you had a lot of large vitreal debris, you could have a vitrectomy. but if 'several doctors' have examined you and cant come up with another diagnosis/procedure, then you are likely stuck at 20/80 in that eye.
http://www.vrmny.com/index.html
my husband went to them for his eye problem. Central Serous Retinopathy. i highly reccomend them. They are cutting edge not only in research but eye care surgicallly and medically.