REALLY fine grit sandpaper and some 3m plastic polish will make them like new. However, since they're Rx, it might modify the curvature (not sure how accurate they have to be).

2000+ grit sandpaper will get out the scratches. I have heard 6000 grit exists but I can't find it, you might want to look tho ... esp since they're your glasses Might want to 'practice' on some crappy lenses, I have gotten headlights to be VERY VERY clear with this method; takes a long time.

 

it depends on the type of lenses, vermillion, polarized etc, until you know what kind of lenses, its hard to recommend how to maybe be able to make them better, if even possible

 

vermillion ... nice. In any case, all polarization, etc is done as a coating (unless they have changed things around lately which I think is unlikely). Any sanding will PROBABLY remove those coatings IF the scratches are deep enough to, of course, cut through those coatings.

If you want to try it, the CD scratch remover will do basically the same thing as the 3M Plastic polish but the polish seems to do a bit better job. As well, there are 2 stages to the plastic polish, a scratch remover and a clarity enhancer (something like that). The first one fills in cracks but leaves the lense a little smokey and #2 makes the plastic all shineylike. The CD scratch stuff is almost identical to the water/toothpaste mixture people use quite a bit for softer plastics.

Sanding, in retrospect, is probably a poor idea due to the coatings. Sorry for suggesting it.

I believe no matter what kind of lenses they are (coloured (ie: vermillion), polarized, anti scratch) polish would be the way to go.

Oh, it's also worth noting that the CD scratch remover is a LITTLE abrasive, the clarity 3M stuff is not abrasive at all.