The most important factor to consider when choosing a new frame is the fit of the frame. It doesn't matter how good a frame looks if you always have to push it back up your nose. Make sure that the frame fits the bridge of your nose without slipping down, remembering that the finished spectacles will be heavier than the frame when you try it on.
The frame should not rest on your cheeks. Try smiling while you are trying on the frame - if it rides up, then it is sitting on your cheeks, not your nose.
A frame should also suit your lifestyle. If you are very active, or wear your spectacles while exercising, then a smaller frame may be better, since your spectacles will be less likely to fog up than if they have a large, close-fitting frame.
Re-Using Your Frames
Re-Using your own frame can be a good alternative to searching for another frame that suits you, or spending a lot of money on a new frame when your budget is a little low.
But before considering this there are a few things you should bare in mind. Plastic frames must be heated and stretched to insert new lenses. Because the resins used in plastic frames tend to become hard and brittle with age, there is a high risk of breakage when you re-use an old plastic frame, regardless of how much the frame cost when you bought it, or which manufacturer made it.
A progressive lens requires perfect centration for an ideal fit. An old frame might have slight distortions and a perfect fit might not be possible. It is best not to reuse a frame to fit a progressive lens.
