Michael,
With my Leica, I began to have trouble with critical focussing closer than one meter and realized that I needed a corrective lens between me and the camera. Since closeup focussing is the most critical, I started using my midrange glasses, aka, monitor glasses when using the Leica for portraiture. I found I couldn't align the correct portion of my tri-focal quickly enough. Might help if you got a pair.
Take care,
tom