For driving, I chose the bifocal approach. I went out to the car at the opticians with a felt tip and model glasses. From the drivers seat I drew a line across the lens at the point of the dashboard, which is where the bifocal becomes blurry. So above that point is perfectly clear distance and below that point is perfectly clear instrument panel. It took a little convincing them to make them that way, but I always do it now.
I had some bifocal sun glasses like that but they would eventually get lost and/or scratched.
With disposable lenses I just toss em after a month and start fresh.
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