I have always had Varifocals. They are brilliant. I don't trip up, becuase they adjust so quickly as I move my head, you don't notice.
http://www.specsavers.co.uk/offers/30day-varifocal-trial/?gclid=CMvMwKvjpagCFUEa4Qod9BZOHA

I use the computer a lot and have no problems whatsoever, or for distance and driving. All you get is a slight distortion at the very side of the lenses but you don't normally look through that area.

I also have my lenses made with transition, which means they adjust to the light. So they act as sunglasses as well. Does not affect driving. Something like these. They also do something to them for night driving.
http://gb.transitions.com/experience/default.aspx

I would say that is what you want. I have been wearing them for 20 years.

Hope that helps.