Things I think are important:
- Use glass for better scratch resistance and a better quality of the
anti-reflection layer;
- The division between far- and near sight portion has to be perfectly
horizontal and be at the same position for both glasses;
- The optical center of the lenses has to coincide as perfectly as
possible
with the center of your pupils.

Thanks for your input.

My far-vision prescription is way too bad for real "glass" lenses anymore,
so I'm stuck with the super-expensive poly-carbonate --or the 14-ounce Coke
bottle lenses...

I'll keep your other advice in mind when the time comes. I'm still fighting
getting them.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"