My eye doctor told me it is usually difficult to switch from lined bifocals to the varilux and graduated lens. I never had the lined ones, but I love the graduated lenses. They work great for the computer at work because I stand all day and look down at the screen through the bottom part of the lens, But I need computer glasses for my home computer, or I get a neck ache from tilting my head back to look through the lower part of the lens.
I had the "progressive" lenses first, and just couldn't handle them. That's what they say though...you either love 'em or hate 'em. You really need to try both.
I don't remember if my mom wears glasses for the computer or not. I don't think she does.