If you want to avoid the down ward spiral of getting glasses then having to get stronger and stronger lenses as the glasses weaken the muscles in you eyes. Try the Bates Method at any age. It is highly successfull in improving vision problems as most vision issues come from straining the muscles or under usage. It's free so give it a try before buying expensive glasses
see www.youtube.com/watch?v=qL6JV_e-UHI