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Hey Chas --
I guess it really does depend on your Rx. Just to use LensCrafters as an example -- their equipment is the same that is found in the run of the mill processing lab -- it's just not as customized. it's built for their purposes -- but it still gives them a decent processing range of about -12.00 to +8.00 diopters with roughly 4 diopters of cylinder.
They are also limited by lens stock -- they don't stock as much in the higher index plastics because of cost -- there's not much margin in those lenses for them because they are not used as frequently.
So it really depends -- the lightest weight plasitc they carry is polycarbonate -- it's the lightest, most impact-resistant lens on the market. But for real high perscriptions (over -8.00 and over +5.00) the lens has some aberition issues. But I've seen people with higher scripts wear them for the shear fact that they want the lighest lens available.
Give me some details on the Rx and I'll go from there.
-Craig
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