@dynamic Another survey I can't vote on; my choice was bi/tri-focals. I couldn't stand the progressive lenses, because you lose your peripheral vision. I tried them for two weeks to see if I could adjust, but I couldn't do it.
I had a coworker tell me that he threw up for two weeks, then was fine and loves them. Someone else said they had headaches for a week. Others just needed to adapt to turning their head for periphery viewing. YMMV
@dynamic The outside edge of the lens is a different focus with progressive lenses. With a normal lens, you have the same focus across the surface. The bi/tri-focals usually don't extend to the edges as well, so your periphery stays at distance viewing. I started with bifocals and as I got older, I needed the trifocal for middle depth (mostly for computer usage).