I have a pair of bifocals made a special way.
I can't stand the progressive types...make me dizzy.

I have my middle distance (I am near sighted) across the top of rather large old fashioned lenses, and my close up all along the bottom. The division goes across the whole lens, instead of just at the nose portion. This allows me to move my eyes across the whole screen of of the monitor. (ours is not 19 in though.)
The lower part of the lens allows me to see the keyboard.

This way there is no movement of the head/neck...which over time can really HURT. On really good days, I use my trifocals, and sit farther back. Sometimes I can do that without pain.

The new glasses with small lenses...I think are terrible for multivision needs. When I ordered my second pair, I had to haggle with the optician..they were very resistant to the whole lens division. But our pilot cousin has his this way now too so he can view the cockpit better. I just bought a pair of on sale frames that are not what I'd wear "out" socially and use them around the house. The second pair doesn't have transition, or anything fancy so they didn't cost too much.

I also have a pair of bifocals with my far vision and intermediate vision only....no close. This helps me navigate stairs and public places better without tripping/falling. But I had to have trifocals at work... so I have learned to deal with them pretty much. But on computer they can be painful over time for the neck!