I am a professional pilot and use graduated bifocals that are focused at 30 inches at the top of the lower section, and at 10 inches at the very bottom. I quickly learned to adjust, and find them great for flying. I can sharply focus on the panel and then read a chart, things I can't do with conventional bifocals.
Hidalgo will even put upper bifocals to let you read the upper switch panels if that's what you need. Their quality is good, and the prices are competitive.
In any case, I really like the segmented bifocals.
------------------
Nick Lappos