I have tri-focals with progressive lenses so there is no line. Takes a bit of getting used to as you need to move your head up and down to adjust the focus. My eye doctor told me people usually need to get new prescriptions after 6 months wearing them. I haven't had to do that but it is something to keep in mind. Especially if you are considering the transitions auto-shading lenses which add a lot to the cost. It might be better to wait on those until later. Or get a seperate pair of sunglasses which is probably cheaper and will last longer too. The transitions lenses can scratch easily in my experience.