My wife worked in the optical field for many years, she answered this way. Progressive lenses are just bi-focals without the visible line. That being said, I've been wearing strictly progressive lenses for a long time. Yes, polarized sunglasses can be made in the progressive format. Other than initially getting used to them, the only drawback I've encountered is trying to see through my rifle scopes. As Dwight mentioned, you could also buy "Cocoons". They fit over your regular glasses.