I hate these varifocals when I got them, and was in most of a mind to send them back, but life intervened and resulted in inadvertent perseverance.
Anyway, I'm now happy with them now, my brain has figured out how to position my head to look through the correct area of the lens. Seems fine with the computer, reading and for distance vision. Owl-like positioning of your head to optimize the process is something your brain as to learn, but eventually it becomes automatic.
Multifocal contacts lenses, on the other hand, have been awful, I'm not sure what they're supposed to do, but in my experience they don't (I do have very high prescription though, it takes light so long to get through any lens that I'm seeing the past).