Don't know what happened there

Varifocals are great in general, but will always have a problem where your head position is fixed relative to the object you are looking at.
With a book, you can always move the book in your hands to put it in the right area of your field of vision: not so easy with a computer screen

On my last set of varifocals I got a second pair adjusted for driving as I'd found that in the slightly reclined sitting position in the car I was having to dip my chin and getting neck strain on long journeys. The optician dropped the optical centre by about a millimetre. Made driving a lot more comfortable. Mind you, the glasses aren't so good for general use, as I have to look down further for reading.

It's all about compromise.

nick