I just use a pair of off the shelf/display reading glasses for computer use..
It is sooo much simpler for me.
I keep a spare pair on the desk and in my hobby area and only use my bi focals or my progressives when I go to the store.

I have a heck of a time trying to use the bifocals or progressives with the computer. Wears my neck out and makes me frustrated.

Part of it is because the monitor is much farther away than when I am reading a book or magazine. So the focus distance is different.
My monitor is about 36" away from me when I sit back in my chair and the keyboard drawer is all the way out.