Honestly, I don't see why more people don't merely keep the same eye glasses frames and just replace the lenses. The last time I replaced my glasses, about six months ago, I did this to cut cost. It meant that I could keep my simple, chic black square frames, which were still in great condition, rather than worrying about finding a new style that would look good on my face.
If you do choose to reuse the same frames, good optometrists' offices should have a techinician who can help to alter and adjust your frames so that they still fit your facial structure, as well as replacing the lenses with new ones without damaging your frames. While I know it might be tiring to keep the same frames for years and years if you don't like them, if you are used to the ones you have, it can be better than the hassle and expense of picking out new ones.