Originally Posted by chaoticneutralGreat question, im going to throw a dart and say the backside progressive sits closer to the eye giving you wider field of vision with less distortion in the periphery. I hope im not just drinking the cool-aid on this. Ive actually experienced the difference between a conventional or traditional front side progressive lens like the comfort, and see a big difference in the comfort enhanced.
The New Comfort has a shorter and wider corridor than the original Comfort- you're probably seeing the difference in the fundamental PAL design, not the placement of the progressive optics.
A full backside side PAL, in and of itself, does not explain any significant reduction in zone width, skew distortion, magnification, and aberrations for a given PAL design.
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