Raymond,
This weekend will be the first time I can fly with my prescription progressive bi-focals. My other sunglasses are not bifocals and are only for distance. They have a lighter tint and have worked well for the last year but I think the darker tinted progressives are going to work out better. My new "normal" glasses are very good Ciba progressive lenses and like stripes says they are more expensive but better progressive lenses seem to work in more distance situations. I am going to have to break down one day and buy a good set of progressive lens sunglasses, at least better than the ones I have now. Good luck.